diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index de4439ece..331bc9cfb 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -203,6 +203,8 @@ add_library(citra_core STATIC
     hle/service/ac/ac_u.h
     hle/service/act/act.cpp
     hle/service/act/act.h
+    hle/service/act/act_errors.cpp
+    hle/service/act/act_errors.h
     hle/service/act/act_a.cpp
     hle/service/act/act_a.h
     hle/service/act/act_u.cpp
diff --git a/src/core/hle/service/act/act.cpp b/src/core/hle/service/act/act.cpp
index ddac50e2d..46c4b62bc 100644
--- a/src/core/hle/service/act/act.cpp
+++ b/src/core/hle/service/act/act.cpp
@@ -7,6 +7,7 @@
 #include "core/hle/kernel/shared_memory.h"
 #include "core/hle/service/act/act.h"
 #include "core/hle/service/act/act_a.h"
+#include "core/hle/service/act/act_errors.h"
 #include "core/hle/service/act/act_u.h"
 
 namespace Service::ACT {
@@ -31,15 +32,28 @@ void Module::Interface::Initialize(Kernel::HLERequestContext& ctx) {
     rb.Push(ResultSuccess);
 }
 
-void Module::Interface::GetAccountDataBlock(Kernel::HLERequestContext& ctx) {
+void Module::Interface::GetErrorCode(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx);
-    const auto unknown = rp.Pop<u8>();
+    const auto result = rp.Pop<Result>();
+
+    LOG_DEBUG(Service_ACT, "called result={:08X}", result.raw);
+
+    const u32 error_code = GetACTErrorCode(result);
+
+    IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
+    rb.Push(ResultSuccess);
+    rb.Push(error_code);
+}
+
+void Module::Interface::GetAccountInfo(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp(ctx);
+    const auto account_slot = rp.Pop<u8>();
     const auto size = rp.Pop<u32>();
     const auto block_id = rp.Pop<u32>();
     [[maybe_unused]] auto output_buffer = rp.PopMappedBuffer();
 
-    LOG_DEBUG(Service_ACT, "(STUBBED) called unknown={:02X}, size={:08X}, block_id={:08X}", unknown,
-              size, block_id);
+    LOG_DEBUG(Service_ACT, "(STUBBED) called account_slot={:02X}, size={:08X}, block_id={:08X}",
+              account_slot, size, block_id);
 
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
     rb.Push(ResultSuccess);
diff --git a/src/core/hle/service/act/act.h b/src/core/hle/service/act/act.h
index cbd5e6eb1..ec9f954bb 100644
--- a/src/core/hle/service/act/act.h
+++ b/src/core/hle/service/act/act.h
@@ -38,9 +38,19 @@ public:
         void Initialize(Kernel::HLERequestContext& ctx);
 
         /**
-         * ACT::GetAccountDataBlock service function.
+         * ACT::GetErrorCode service function.
          * Inputs:
-         *     1 : u8 Unknown
+         *     1 : Result code
+         * Outputs:
+         *     1 : Result of function, 0 on success, otherwise error code
+         *     2 : Error code
+         */
+        void GetErrorCode(Kernel::HLERequestContext& ctx);
+
+        /**
+         * ACT::GetAccountInfo service function.
+         * Inputs:
+         *     1 : Account slot
          *     2 : Size
          *     3 : Block ID
          *     4 : Output Buffer Mapping Translation Header ((Size << 4) | 0xC)
@@ -48,7 +58,7 @@ public:
          * Outputs:
          *     1 : Result of function, 0 on success, otherwise error code
          */
-        void GetAccountDataBlock(Kernel::HLERequestContext& ctx);
+        void GetAccountInfo(Kernel::HLERequestContext& ctx);
     };
 
 private:
diff --git a/src/core/hle/service/act/act_a.cpp b/src/core/hle/service/act/act_a.cpp
index 41d8da4a4..281016022 100644
--- a/src/core/hle/service/act/act_a.cpp
+++ b/src/core/hle/service/act/act_a.cpp
@@ -12,15 +12,61 @@ ACT_A::ACT_A(std::shared_ptr<Module> act) : Module::Interface(std::move(act), "a
         // act:u shared commands
         // clang-format off
         {0x0001, &ACT_A::Initialize, "Initialize"},
-        {0x0002, nullptr, "GetErrorCode"},
-        {0x0006, &ACT_A::GetAccountDataBlock, "GetAccountDataBlock"},
+        {0x0002, &ACT_A::GetErrorCode, "GetErrorCode"},
+        {0x0003, nullptr, "GetLastResponseCode"},
+        {0x0005, nullptr, "GetCommonInfo"},
+        {0x0006, &ACT_A::GetAccountInfo, "GetAccountInfo"},
+        {0x0007, nullptr, "GetResultAsync"},
+        {0x0008, nullptr, "GetMiiImageData"},
+        {0x0009, nullptr, "SetNfsPassword"},
         {0x000B, nullptr, "AcquireEulaList"},
+        {0x000C, nullptr, "AcquireTimeZoneList"},
         {0x000D, nullptr, "GenerateUuid"},
+        {0x000F, nullptr, "FindSlotNoByUuid"},
+        {0x0010, nullptr, "SaveData"},
+        {0x0011, nullptr, "GetTransferableId"},
+        {0x0012, nullptr, "AcquireNexServiceToken"},
+        {0x0013, nullptr, "GetNexServiceToken"},
+        {0x0014, nullptr, "AcquireIndependentServiceToken"},
+        {0x0015, nullptr, "GetIndependentServiceToken"},
+        {0x0016, nullptr, "AcquireAccountInfo"},
+        {0x0017, nullptr, "AcquireAccountIdByPrincipalId"},
+        {0x0018, nullptr, "AcquirePrincipalIdByAccountId"},
+        {0x0019, nullptr, "AcquireMii"},
+        {0x001A, nullptr, "AcquireAccountInfoEx"},
+        {0x001D, nullptr, "InquireMailAddress"},
+        {0x001E, nullptr, "AcquireEula"},
+        {0x001F, nullptr, "AcquireEulaLanguageList"},
         // act:a
+        {0x0402, nullptr, "CreateConsoleAccount"},
+        {0x0403, nullptr, "CommitConsoleAccount"},
+        {0x0404, nullptr, "UnbindServerAccount"},
+        {0x0405, nullptr, "DeleteConsoleAccount"},
+        {0x0407, nullptr, "UnloadConsoleAccount"},
+        {0x0408, nullptr, "EnableAccountPasswordCache"},
+        {0x0409, nullptr, "SetDefaultAccount"},
+        {0x040A, nullptr, "ReplaceAccountId"},
+        {0x040B, nullptr, "GetSupportContext"},
+        {0x0412, nullptr, "UpdateMii"},
         {0x0413, nullptr, "UpdateMiiImage"},
+        {0x0414, nullptr, "InquireAccountIdAvailability"},
+        {0x0415, nullptr, "BindToNewServerAccount"},
+        {0x0416, nullptr, "BindToExistentServerAccount"},
+        {0x0417, nullptr, "InquireBindingToExistentServerAccount"},
+        {0x041A, nullptr, "AcquireAccountTokenEx"},
         {0x041B, nullptr, "AgreeEula"},
+        {0x041C, nullptr, "SyncAccountInfo"},
+        {0x041E, nullptr, "UpdateAccountPassword"},
+        {0x041F, nullptr, "ReissueAccountPassword"},
+        {0x0420, nullptr, "SetAccountPasswordInput"},
         {0x0421, nullptr, "UploadMii"},
         {0x0423, nullptr, "ValidateMailAddress"},
+        {0x0423, nullptr, "SendConfirmationMail"},
+        {0x0428, nullptr, "ApproveByCreditCard"},
+        {0x0428, nullptr, "SendCoppaCodeMail"},
+        {0x042F, nullptr, "UpdateAccountInfoEx"},
+        {0x0430, nullptr, "UpdateAccountMailAddress"},
+        {0x0435, nullptr, "DeleteServerAccount"},
         // clang-format on
     };
     RegisterHandlers(functions);
diff --git a/src/core/hle/service/act/act_errors.cpp b/src/core/hle/service/act/act_errors.cpp
new file mode 100644
index 000000000..cab975d00
--- /dev/null
+++ b/src/core/hle/service/act/act_errors.cpp
@@ -0,0 +1,757 @@
+// Copyright 2024 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/hle/service/act/act_errors.h"
+
+namespace Service::ACT {
+
+u32 GetACTErrorCode(Result result) {
+    u32 error_code = ErrCodes::Unknown;
+    if (result.module == ErrorModule::ACT) {
+        switch (result.description) {
+        case ErrDescriptions::MySuccess:
+            error_code = ErrCodes::MySuccess;
+            break;
+        case ErrDescriptions::MailAddressNotConfirmed:
+            error_code = ErrCodes::MailAddressNotConfirmed;
+            break;
+        case ErrDescriptions::LibraryError:
+            error_code = ErrCodes::LibraryError;
+            break;
+        case ErrDescriptions::NotInitialized:
+            error_code = ErrCodes::NotInitialized;
+            break;
+        case ErrDescriptions::AlreadyInitialized:
+            error_code = ErrCodes::AlreadyInitialized;
+            break;
+        case ErrDescriptions::ErrDesc103:
+            error_code = ErrCodes::ErrCode225103;
+            break;
+        case ErrDescriptions::ErrDesc104:
+            error_code = ErrCodes::ErrCode225104;
+            break;
+        case ErrDescriptions::Busy:
+            error_code = ErrCodes::Busy;
+            break;
+        case ErrDescriptions::ErrDesc112:
+            error_code = ErrCodes::ErrCode225112;
+            break;
+        case ErrDescriptions::NotImplemented:
+            error_code = ErrCodes::NotImplemented;
+            break;
+        case ErrDescriptions::Deprecated:
+            error_code = ErrCodes::Deprecated;
+            break;
+        case ErrDescriptions::DevelopmentOnly:
+            error_code = ErrCodes::DevelopmentOnly;
+            break;
+        case ErrDescriptions::InvalidArgument:
+            error_code = ErrCodes::InvalidArgument;
+            break;
+        case ErrDescriptions::InvalidPointer:
+            error_code = ErrCodes::InvalidPointer;
+            break;
+        case ErrDescriptions::OutOfRange:
+            error_code = ErrCodes::OutOfRange;
+            break;
+        case ErrDescriptions::InvalidSize:
+            error_code = ErrCodes::InvalidSize;
+            break;
+        case ErrDescriptions::InvalidFormat:
+            error_code = ErrCodes::InvalidFormat;
+            break;
+        case ErrDescriptions::InvalidHandle:
+            error_code = ErrCodes::InvalidHandle;
+            break;
+        case ErrDescriptions::InvalidValue:
+            error_code = ErrCodes::InvalidValue;
+            break;
+        case ErrDescriptions::InternalError:
+            error_code = ErrCodes::InternalError;
+            break;
+        case ErrDescriptions::EndOfStream:
+            error_code = ErrCodes::EndOfStream;
+            break;
+        case ErrDescriptions::FileError:
+            error_code = ErrCodes::FileError;
+            break;
+        case ErrDescriptions::FileNotFound:
+            error_code = ErrCodes::FileNotFound;
+            break;
+        case ErrDescriptions::FileVersionMismatch:
+            error_code = ErrCodes::FileVersionMismatch;
+            break;
+        case ErrDescriptions::FileIOError:
+            error_code = ErrCodes::FileIOError;
+            break;
+        case ErrDescriptions::FileTypeMismatch:
+            error_code = ErrCodes::FileTypeMismatch;
+            break;
+        case ErrDescriptions::ErrDesc315:
+            error_code = ErrCodes::ErrCode225315;
+            break;
+        case ErrDescriptions::OutOfResource:
+            error_code = ErrCodes::OutOfResource;
+            break;
+        case ErrDescriptions::ShortOfBuffer:
+            error_code = ErrCodes::ShortOfBuffer;
+            break;
+        case ErrDescriptions::OutOfMemory:
+            error_code = ErrCodes::OutOfMemory;
+            break;
+        case ErrDescriptions::OutOfGlobalHeap:
+            error_code = ErrCodes::OutOfGlobalHeap;
+            break;
+        case ErrDescriptions::ErrDesc350:
+            error_code = ErrCodes::ErrCode225350;
+            break;
+        case ErrDescriptions::ErrDesc351:
+            error_code = ErrCodes::ErrCode225351;
+            break;
+        case ErrDescriptions::ErrDesc352:
+            error_code = ErrCodes::ErrCode225352;
+            break;
+        case ErrDescriptions::ErrDesc360:
+            error_code = ErrCodes::ErrCode225360;
+            break;
+        case ErrDescriptions::ErrDesc361:
+            error_code = ErrCodes::ErrCode225361;
+            break;
+        case ErrDescriptions::ErrDesc362:
+            error_code = ErrCodes::ErrCode225362;
+            break;
+        case ErrDescriptions::ErrDesc363:
+            error_code = ErrCodes::ErrCode225363;
+            break;
+        case ErrDescriptions::AccountManagementError:
+            error_code = ErrCodes::AccountManagementError;
+            break;
+        case ErrDescriptions::AccountNotFound:
+            error_code = ErrCodes::AccountNotFound;
+            break;
+        case ErrDescriptions::SlotsFull:
+            error_code = ErrCodes::SlotsFull;
+            break;
+        case ErrDescriptions::AccountNotLoaded:
+            error_code = ErrCodes::AccountNotLoaded;
+            break;
+        case ErrDescriptions::AccountAlreadyLoaded:
+            error_code = ErrCodes::AccountAlreadyLoaded;
+            break;
+        case ErrDescriptions::AccountLocked:
+            error_code = ErrCodes::AccountLocked;
+            break;
+        case ErrDescriptions::NotNetworkAccount:
+            error_code = ErrCodes::NotNetworkAccount;
+            break;
+        case ErrDescriptions::NotLocalAccount:
+            error_code = ErrCodes::NotLocalAccount;
+            break;
+        case ErrDescriptions::AccountNotCommited:
+            error_code = ErrCodes::AccountCommited;
+            break;
+        case ErrDescriptions::ErrDesc431:
+            error_code = ErrCodes::ErrCode225431;
+            break;
+        case ErrDescriptions::ErrDesc432:
+            error_code = ErrCodes::ErrCode225432;
+            break;
+        case ErrDescriptions::ErrDesc433:
+            error_code = ErrCodes::ErrCode225433;
+            break;
+        case ErrDescriptions::ErrDesc451:
+            error_code = ErrCodes::ErrCode221101;
+            break;
+        case ErrDescriptions::AuthenticationError:
+            error_code = ErrCodes::AuthenticationError;
+            break;
+        case ErrDescriptions::HttpError:
+            error_code = ErrCodes::HttpError;
+            break;
+        case ErrDescriptions::ErrDesc502:
+            error_code = ErrCodes::ErrCode225502;
+            break;
+        case ErrDescriptions::ErrDesc503:
+            error_code = ErrCodes::ErrCode225503;
+            break;
+        case ErrDescriptions::ErrDesc504:
+            error_code = ErrCodes::ErrCode225504;
+            break;
+        case ErrDescriptions::ErrDesc505:
+            error_code = ErrCodes::ErrCode225505;
+            break;
+        case ErrDescriptions::ErrDesc506:
+            error_code = ErrCodes::ErrCode225506;
+            break;
+        case ErrDescriptions::ErrDesc507:
+            error_code = ErrCodes::ErrCode225507;
+            break;
+        case ErrDescriptions::ErrDesc508:
+            error_code = ErrCodes::ErrCode225508;
+            break;
+        case ErrDescriptions::ErrDesc509:
+            error_code = ErrCodes::ErrCode225509;
+            break;
+        case ErrDescriptions::ErrDesc510:
+            error_code = ErrCodes::ErrCode225510;
+            break;
+        case ErrDescriptions::ErrDesc511:
+            error_code = ErrCodes::ErrCode225511;
+            break;
+        case ErrDescriptions::ErrDesc512:
+            error_code = ErrCodes::ErrCode225512;
+            break;
+        case ErrDescriptions::ErrDesc513:
+            error_code = ErrCodes::ErrCode225513;
+            break;
+        case ErrDescriptions::ErrDesc514:
+            error_code = ErrCodes::ErrCode225514;
+            break;
+        case ErrDescriptions::ErrDesc515:
+            error_code = ErrCodes::ErrCode225515;
+            break;
+        case ErrDescriptions::ErrDesc516:
+            error_code = ErrCodes::ErrCode225516;
+            break;
+        case ErrDescriptions::ErrDesc517:
+            error_code = ErrCodes::ErrCode225517;
+            break;
+        case ErrDescriptions::ErrDesc518:
+            error_code = ErrCodes::ErrCode225518;
+            break;
+        case ErrDescriptions::ErrDesc519:
+            error_code = ErrCodes::ErrCode225519;
+            break;
+        case ErrDescriptions::ErrDesc520:
+            error_code = ErrCodes::ErrCode225520;
+            break;
+        case ErrDescriptions::ErrDesc521:
+            error_code = ErrCodes::ErrCode225521;
+            break;
+        case ErrDescriptions::ErrDesc522:
+            error_code = ErrCodes::ErrCode225522;
+            break;
+        case ErrDescriptions::ErrDesc523:
+            error_code = ErrCodes::ErrCode225523;
+            break;
+        case ErrDescriptions::ErrDesc524:
+            error_code = ErrCodes::ErrCode225524;
+            break;
+        case ErrDescriptions::ErrDesc525:
+            error_code = ErrCodes::ErrCode225525;
+            break;
+        case ErrDescriptions::ErrDesc526:
+            error_code = ErrCodes::ErrCode225526;
+            break;
+        case ErrDescriptions::ErrDesc527:
+            error_code = ErrCodes::ErrCode225527;
+            break;
+        case ErrDescriptions::ErrDesc528:
+            error_code = ErrCodes::ErrCode225528;
+            break;
+        case ErrDescriptions::ErrDesc529:
+            error_code = ErrCodes::ErrCode225529;
+            break;
+        case ErrDescriptions::ErrDesc530:
+            error_code = ErrCodes::ErrCode225530;
+            break;
+        case ErrDescriptions::ErrDesc531:
+            error_code = ErrCodes::ErrCode225531;
+            break;
+        case ErrDescriptions::ErrDesc532:
+            error_code = ErrCodes::ErrCode225532;
+            break;
+        case ErrDescriptions::ErrDesc533:
+            error_code = ErrCodes::ErrCode225533;
+            break;
+        case ErrDescriptions::ErrDesc534:
+            error_code = ErrCodes::ErrCode225534;
+            break;
+        case ErrDescriptions::ErrDesc535:
+            error_code = ErrCodes::ErrCode225535;
+            break;
+        case ErrDescriptions::ErrDesc536:
+            error_code = ErrCodes::ErrCode225536;
+            break;
+        case ErrDescriptions::ErrDesc537:
+            error_code = ErrCodes::ErrCode225537;
+            break;
+        case ErrDescriptions::ErrDesc538:
+            error_code = ErrCodes::ErrCode225538;
+            break;
+        case ErrDescriptions::ErrDesc539:
+            error_code = ErrCodes::ErrCode225539;
+            break;
+        case ErrDescriptions::ErrDesc540:
+            error_code = ErrCodes::ErrCode225540;
+            break;
+        case ErrDescriptions::ErrDesc541:
+            error_code = ErrCodes::ErrCode225541;
+            break;
+        case ErrDescriptions::ErrDesc542:
+            error_code = ErrCodes::ErrCode225542;
+            break;
+        case ErrDescriptions::ErrDesc543:
+            error_code = ErrCodes::ErrCode225543;
+            break;
+        case ErrDescriptions::ErrDesc544:
+            error_code = ErrCodes::ErrCode225544;
+            break;
+        case ErrDescriptions::ErrDesc545:
+            error_code = ErrCodes::ErrCode225545;
+            break;
+        case ErrDescriptions::ErrDesc546:
+            error_code = ErrCodes::ErrCode225546;
+            break;
+        case ErrDescriptions::ErrDesc547:
+            error_code = ErrCodes::ErrCode225547;
+            break;
+        case ErrDescriptions::ErrDesc548:
+            error_code = ErrCodes::ErrCode225548;
+            break;
+        case ErrDescriptions::ErrDesc549:
+            error_code = ErrCodes::ErrCode225549;
+            break;
+        case ErrDescriptions::ErrDesc550:
+            error_code = ErrCodes::ErrCode225550;
+            break;
+        case ErrDescriptions::ErrDesc551:
+            error_code = ErrCodes::ErrCode225551;
+            break;
+        case ErrDescriptions::ErrDesc552:
+            error_code = ErrCodes::ErrCode225552;
+            break;
+        case ErrDescriptions::ErrDesc553:
+            error_code = ErrCodes::ErrCode225553;
+            break;
+        case ErrDescriptions::RequestError:
+            error_code = ErrCodes::RequestError;
+            break;
+        case ErrDescriptions::BadFormatParameter:
+            error_code = ErrCodes::BadFormatParameter;
+            break;
+        case ErrDescriptions::BadFormatRequest:
+            error_code = ErrCodes::BadFormatRequest;
+            break;
+        case ErrDescriptions::RequestParameterMissing:
+            error_code = ErrCodes::RequestParameterMissing;
+            break;
+        case ErrDescriptions::WrongHttpMethod:
+            error_code = ErrCodes::WrongHttpMethod;
+            break;
+        case ErrDescriptions::ResponseError:
+            error_code = ErrCodes::ResponseError;
+            break;
+        case ErrDescriptions::BadFormatResponse:
+            error_code = ErrCodes::BadFormatResponse;
+            break;
+        case ErrDescriptions::ResponseItemMissing:
+            error_code = ErrCodes::ResponseItemMissing;
+            break;
+        case ErrDescriptions::ResponseTooLarge:
+            error_code = ErrCodes::ResponseTooLarge;
+            break;
+        case ErrDescriptions::InvalidCommonParameter:
+            error_code = ErrCodes::InvalidCommonParameter;
+            break;
+        case ErrDescriptions::InvalidPlatformId:
+            error_code = ErrCodes::InvalidPlatformId;
+            break;
+        case ErrDescriptions::UnauthorizedDevice:
+            error_code = ErrCodes::UnauthorizedDevice;
+            break;
+        case ErrDescriptions::InvalidSerialId:
+            error_code = ErrCodes::InvalidSerialId;
+            break;
+        case ErrDescriptions::InvalidMacAddress:
+            error_code = ErrCodes::InvalidMacAddress;
+            break;
+        case ErrDescriptions::InvalidRegion:
+            error_code = ErrCodes::InvalidRegion;
+            break;
+        case ErrDescriptions::InvalidCountry:
+            error_code = ErrCodes::InvalidCountry;
+            break;
+        case ErrDescriptions::InvalidLanguage:
+            error_code = ErrCodes::InvalidLanguage;
+            break;
+        case ErrDescriptions::UnauthorizedClient:
+            error_code = ErrCodes::UnauthorizedClient;
+            break;
+        case ErrDescriptions::DeviceIdEmpty:
+            error_code = ErrCodes::DeviceIdEmpty;
+            break;
+        case ErrDescriptions::SerialIdEmpty:
+            error_code = ErrCodes::SerialIdEmpty;
+            break;
+        case ErrDescriptions::PlatformIdEmpty:
+            error_code = ErrCodes::PlatformIdEmpty;
+            break;
+        case ErrDescriptions::InvalidUniqueId:
+            error_code = ErrCodes::InvalidUniqueId;
+            break;
+        case ErrDescriptions::InvalidClientId:
+            error_code = ErrCodes::InvalidClientId;
+            break;
+        case ErrDescriptions::InvalidClientKey:
+            error_code = ErrCodes::InvalidClientKey;
+            break;
+        case ErrDescriptions::InvalidNexClientId:
+            error_code = ErrCodes::InvalidNexClientId;
+            break;
+        case ErrDescriptions::InvalidGameServerId:
+            error_code = ErrCodes::InvalidGameServerId;
+            break;
+        case ErrDescriptions::GameServerIdEnvironmentNotFound:
+            error_code = ErrCodes::GameServerIdEnvironmentNotFound;
+            break;
+        case ErrDescriptions::GameServerIdUniqueIdNotLinked:
+            error_code = ErrCodes::GameServerIdUniqueIdNotLinked;
+            break;
+        case ErrDescriptions::ClientIdUniqueIdNotLinked:
+            error_code = ErrCodes::ClientIdUniqueIdNotLinked;
+            break;
+        case ErrDescriptions::DeviceMismatch:
+            error_code = ErrCodes::DeviceMismatch;
+            break;
+        case ErrDescriptions::CountryMismatch:
+            error_code = ErrCodes::CountryMismatch;
+            break;
+        case ErrDescriptions::EulaNotAccepted:
+            error_code = ErrCodes::EulaNotAccepted;
+            break;
+        case ErrDescriptions::UpdateRequired:
+            error_code = ErrCodes::UpdateRequired;
+            break;
+        case ErrDescriptions::SystemUpdateRequired:
+            error_code = ErrCodes::SystemUpdateRequired;
+            break;
+        case ErrDescriptions::ApplicationUpdateRequired:
+            error_code = ErrCodes::ApplicationUpdateRequired;
+            break;
+        case ErrDescriptions::UnauthorizedRequest:
+            error_code = ErrCodes::UnauthorizedRequest;
+            break;
+        case ErrDescriptions::RequestForbidden:
+            error_code = ErrCodes::RequestForbidden;
+            break;
+        case ErrDescriptions::ResourceNotFound:
+            error_code = ErrCodes::ResourceNotFound;
+            break;
+        case ErrDescriptions::PidNotFound:
+            error_code = ErrCodes::PidNotFound;
+            break;
+        case ErrDescriptions::NexAccountNotFound:
+            error_code = ErrCodes::NexAccountNotFound;
+            break;
+        case ErrDescriptions::GenerateTokenFailure:
+            error_code = ErrCodes::GenerateTokenFailure;
+            break;
+        case ErrDescriptions::RequestNotFound:
+            error_code = ErrCodes::RequestNotFound;
+            break;
+        case ErrDescriptions::MasterPinNotFound:
+            error_code = ErrCodes::MasterPinNotFound;
+            break;
+        case ErrDescriptions::MailTextNotFound:
+            error_code = ErrCodes::MailTextNotFound;
+            break;
+        case ErrDescriptions::SendMailFailure:
+            error_code = ErrCodes::SendMailFailure;
+            break;
+        case ErrDescriptions::ApprovalIdNotFound:
+            error_code = ErrCodes::ApprovalIdNotFound;
+            break;
+        case ErrDescriptions::InvalidEulaParameter:
+            error_code = ErrCodes::InvalidEulaParameter;
+            break;
+        case ErrDescriptions::InvalidEulaCountry:
+            error_code = ErrCodes::InvalidEulaCountry;
+            break;
+        case ErrDescriptions::InvalidEulaCountryAndVersion:
+            error_code = ErrCodes::InvalidEulaCountryAndVersion;
+            break;
+        case ErrDescriptions::EulaNotFound:
+            error_code = ErrCodes::EulaNotFound;
+            break;
+        case ErrDescriptions::PhraseNotAcceptable:
+            error_code = ErrCodes::PhraseNotAcceptable;
+            break;
+        case ErrDescriptions::AccountIdAlreadyExists:
+            error_code = ErrCodes::AccountIdAlreadyExists;
+            break;
+        case ErrDescriptions::AccountIdNotAcceptable:
+            error_code = ErrCodes::AccountIdNotAcceptable;
+            break;
+        case ErrDescriptions::AccountPasswordNotAcceptable:
+            error_code = ErrCodes::AccountPasswordNotAcceptable;
+            break;
+        case ErrDescriptions::MiiNameNotAcceptable:
+            error_code = ErrCodes::MiiNameNotAcceptable;
+            break;
+        case ErrDescriptions::MailAddressNotAcceptable:
+            error_code = ErrCodes::MailAddressNotAcceptable;
+            break;
+        case ErrDescriptions::AccountIdFormatInvalid:
+            error_code = ErrCodes::AccountIdFormatInvalid;
+            break;
+        case ErrDescriptions::AccountIdPasswordSame:
+            error_code = ErrCodes::AccountIdPasswordSame;
+            break;
+        case ErrDescriptions::AccountIdCharNotAcceptable:
+            error_code = ErrCodes::AccountIdCharNotAcceptable;
+            break;
+        case ErrDescriptions::AccountIdSuccessiveSymbol:
+            error_code = ErrCodes::AccountIdSuccessiveSymbol;
+            break;
+        case ErrDescriptions::AccountIdSymbolPositionNotAcceptable:
+            error_code = ErrCodes::AccountIdSymbolPositionNotAcceptable;
+            break;
+        case ErrDescriptions::AccountIdTooManyDigit:
+            error_code = ErrCodes::AccountIdTooManyDigit;
+            break;
+        case ErrDescriptions::AccountPasswordCharNotAcceptable:
+            error_code = ErrCodes::AccountPasswordCharNotAcceptable;
+            break;
+        case ErrDescriptions::AccountPasswordTooFewCharTypes:
+            error_code = ErrCodes::AccountPasswordTooFewCharTypes;
+            break;
+        case ErrDescriptions::AccountPasswordSuccessiveSameChar:
+            error_code = ErrCodes::AccountPasswordSuccessiveSameChar;
+            break;
+        case ErrDescriptions::MailAddressDomainNameNotAcceptable:
+            error_code = ErrCodes::MailAddressDomainNameNotAcceptable;
+            break;
+        case ErrDescriptions::MailAddressDomainNameNotResolved:
+            error_code = ErrCodes::MailAddressDomainNameNotResolved;
+            break;
+        case ErrDescriptions::ErrDesc787:
+            error_code = ErrCodes::ErrCode222587;
+            break;
+        case ErrDescriptions::ReachedAssociationLimit:
+            error_code = ErrCodes::ReachedAssociationLimit;
+            break;
+        case ErrDescriptions::ReachedRegistrationLimit:
+            error_code = ErrCodes::ReachedRegistrationLimit;
+            break;
+        case ErrDescriptions::CoppaNotAccepted:
+            error_code = ErrCodes::CoppaNotAccepted;
+            break;
+        case ErrDescriptions::ParentalControlsRequired:
+            error_code = ErrCodes::ParentalControlsRequired;
+            break;
+        case ErrDescriptions::MiiNotRegistered:
+            error_code = ErrCodes::MiiNotRegistered;
+            break;
+        case ErrDescriptions::DeviceEulaCountryMismatch:
+            error_code = ErrCodes::DeviceEulaCountryMismatch;
+            break;
+        case ErrDescriptions::PendingMigration:
+            error_code = ErrCodes::PendingMigration;
+            break;
+        case ErrDescriptions::WrongUserInput:
+            error_code = ErrCodes::WrongUserInput;
+            break;
+        case ErrDescriptions::WrongAccountPassword:
+            error_code = ErrCodes::WrongAccountPassword;
+            break;
+        case ErrDescriptions::WrongMailAddress:
+            error_code = ErrCodes::WrongMailAddress;
+            break;
+        case ErrDescriptions::WrongAccountPasswordOrMailAddress:
+            error_code = ErrCodes::WrongAccountPasswordOrMailAddress;
+            break;
+        case ErrDescriptions::WrongConfirmationCode:
+            error_code = ErrCodes::WrongConfirmationCode;
+            break;
+        case ErrDescriptions::WrongBirthDateOrMailAddress:
+            error_code = ErrCodes::WrongBirthDateOrMailAddress;
+            break;
+        case ErrDescriptions::WrongAccountMail:
+            error_code = ErrCodes::WrongAccountMail;
+            break;
+        case ErrDescriptions::AccountAlreadyDeleted:
+            error_code = ErrCodes::AccountAlreadyDeleted;
+            break;
+        case ErrDescriptions::AccountIdChanged:
+            error_code = ErrCodes::AccountIdChanged;
+            break;
+        case ErrDescriptions::AuthenticationLocked:
+            error_code = ErrCodes::AuthenticationLocked;
+            break;
+        case ErrDescriptions::DeviceInactive:
+            error_code = ErrCodes::DeviceInactive;
+            break;
+        case ErrDescriptions::CoppaAgreementCanceled:
+            error_code = ErrCodes::CoppaAgreementCanceled;
+            break;
+        case ErrDescriptions::DomainAccountAlreadyExists:
+            error_code = ErrCodes::DomainAccountAlreadyExists;
+            break;
+        case ErrDescriptions::AccountTokenExpired:
+            error_code = ErrCodes::AccountTokenExpired;
+            break;
+        case ErrDescriptions::InvalidAccountToken:
+            error_code = ErrCodes::InvalidAccountToken;
+            break;
+        case ErrDescriptions::AuthenticationRequired:
+            error_code = ErrCodes::AuthenticationRequired;
+            break;
+        case ErrDescriptions::ErrDesc844:
+            error_code = ErrCodes::ErrCode225844;
+            break;
+        case ErrDescriptions::ConfirmationCodeExpired:
+            error_code = ErrCodes::ConfirmationCodeExpired;
+            break;
+        case ErrDescriptions::MailAddressNotValidated:
+            error_code = ErrCodes::MailAddressNotValidated;
+            break;
+        case ErrDescriptions::ExcessiveMailSendRequest:
+            error_code = ErrCodes::ExcessiveMailSendRequest;
+            break;
+        case ErrDescriptions::CreditCardError:
+            error_code = ErrCodes::CreditCardError;
+            break;
+        case ErrDescriptions::CreditCardGeneralFailure:
+            error_code = ErrCodes::CreditCardGeneralFailure;
+            break;
+        case ErrDescriptions::CreditCardDeclined:
+            error_code = ErrCodes::CreditCardDeclined;
+            break;
+        case ErrDescriptions::CreditCardBlacklisted:
+            error_code = ErrCodes::CreditCardBlacklisted;
+            break;
+        case ErrDescriptions::InvalidCreditCardNumber:
+            error_code = ErrCodes::InvalidCreditCardNumber;
+            break;
+        case ErrDescriptions::InvalidCreditCardDate:
+            error_code = ErrCodes::InvalidCreditCardDate;
+            break;
+        case ErrDescriptions::InvalidCreditCardPin:
+            error_code = ErrCodes::InvalidCreditCardPin;
+            break;
+        case ErrDescriptions::InvalidPostalCode:
+            error_code = ErrCodes::InvalidPostalCode;
+            break;
+        case ErrDescriptions::InvalidLocation:
+            error_code = ErrCodes::InvalidLocation;
+            break;
+        case ErrDescriptions::CreditCardDateExpired:
+            error_code = ErrCodes::CreditCardDateExpired;
+            break;
+        case ErrDescriptions::CreditCardNumberWrong:
+            error_code = ErrCodes::CreditCardNumberWrong;
+            break;
+        case ErrDescriptions::CreditCardPinWrong:
+            error_code = ErrCodes::CreditCardPinWrong;
+            break;
+        case ErrDescriptions::Banned:
+            error_code = ErrCodes::Banned;
+            break;
+        case ErrDescriptions::BannedAccount:
+            error_code = ErrCodes::BannedAccount;
+            break;
+        case ErrDescriptions::BannedAccountAll:
+            error_code = ErrCodes::BannedAccountAll;
+            break;
+        case ErrDescriptions::BannedAccountInApplication:
+            error_code = ErrCodes::BannedAccountInApplication;
+            break;
+        case ErrDescriptions::BannedAccountInNexService:
+            error_code = ErrCodes::BannedAccountInNexService;
+            break;
+        case ErrDescriptions::BannedAccountInIndependentService:
+            error_code = ErrCodes::BannedAccountInIndependentService;
+            break;
+        case ErrDescriptions::BannedDevice:
+            error_code = ErrCodes::BannedDevice;
+            break;
+        case ErrDescriptions::BannedDeviceAll:
+            error_code = ErrCodes::BannedDeviceAll;
+            break;
+        case ErrDescriptions::BannedDeviceInApplication:
+            error_code = ErrCodes::BannedDeviceInApplication;
+            break;
+        case ErrDescriptions::BannedDeviceInNexService:
+            error_code = ErrCodes::BannedDeviceInNexService;
+            break;
+        case ErrDescriptions::BannedDeviceInIndependentService:
+            error_code = ErrCodes::BannedDeviceInIndependentService;
+            break;
+        case ErrDescriptions::BannedAccountTemporarily:
+            error_code = ErrCodes::BannedAccountTemporarily;
+            break;
+        case ErrDescriptions::BannedAccountAllTemporarily:
+            error_code = ErrCodes::BannedAccountAllTemporarily;
+            break;
+        case ErrDescriptions::BannedAccountInApplicationTemporarily:
+            error_code = ErrCodes::BannedAccountInApplicationTemporarily;
+            break;
+        case ErrDescriptions::BannedAccountInNexServiceTemporarily:
+            error_code = ErrCodes::BannedAccountInNexServiceTemporarily;
+            break;
+        case ErrDescriptions::BannedAccountInIndependentServiceTemporarily:
+            error_code = ErrCodes::BannedAccountInIndependentServiceTemporarily;
+            break;
+        case ErrDescriptions::BannedDeviceTemporarily:
+            error_code = ErrCodes::BannedDeviceTemporarily;
+            break;
+        case ErrDescriptions::BannedDeviceAllTemporarily:
+            error_code = ErrCodes::BannedDeviceAllTemporarily;
+            break;
+        case ErrDescriptions::BannedDeviceInApplicationTemporarily:
+            error_code = ErrCodes::BannedDeviceInApplicationTemporarily;
+            break;
+        case ErrDescriptions::BannedDeviceInNexServiceTemporarily:
+            error_code = ErrCodes::BannedDeviceInNexServiceTemporarily;
+            break;
+        case ErrDescriptions::BannedDeviceInIndependentServiceTemporarily:
+            error_code = ErrCodes::BannedDeviceInIndependentServiceTemporarily;
+            break;
+        case ErrDescriptions::ServiceNotProvided:
+            error_code = ErrCodes::ServiceNotProvided;
+            break;
+        case ErrDescriptions::UnderMaintenance:
+            error_code = ErrCodes::UnderMaintenance;
+            break;
+        case ErrDescriptions::ServiceClosed:
+            error_code = ErrCodes::ServiceClosed;
+            break;
+        case ErrDescriptions::NintendoNetworkClosed:
+            error_code = ErrCodes::NintendoNetworkClosed;
+            break;
+        case ErrDescriptions::NotProvidedCountry:
+            error_code = ErrCodes::NotProvidedCountry;
+            break;
+        case ErrDescriptions::RestrictionError:
+            error_code = ErrCodes::RestrictionError;
+            break;
+        case ErrDescriptions::RestrictedByAge:
+            error_code = ErrCodes::RestrictedByAge;
+            break;
+        case ErrDescriptions::RestrictedByParentalControls:
+            error_code = ErrCodes::RestrictedByParentalControls;
+            break;
+        case ErrDescriptions::OnGameInternetCommunicationRestricted:
+            error_code = ErrCodes::OnGameInternetCommunicationRestricted;
+            break;
+        case ErrDescriptions::InternalServerError:
+            error_code = ErrCodes::InternalServerError;
+            break;
+        case ErrDescriptions::UnknownServerError:
+            error_code = ErrCodes::UnknownServerError;
+            break;
+        case ErrDescriptions::UnauthenticatedAfterSalvage:
+            error_code = ErrCodes::UnauthenticatedAfterSalvage;
+            break;
+        case ErrDescriptions::AuthenticationFailureUnknown:
+            error_code = ErrCodes::AuthenticationFailureUnknown;
+            break;
+        }
+    }
+
+    return error_code;
+}
+
+} // namespace Service::ACT
diff --git a/src/core/hle/service/act/act_errors.h b/src/core/hle/service/act/act_errors.h
new file mode 100644
index 000000000..8a65eaeda
--- /dev/null
+++ b/src/core/hle/service/act/act_errors.h
@@ -0,0 +1,613 @@
+// Copyright 2024 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/hle/service/service.h"
+
+namespace Service::ACT {
+
+namespace ErrDescriptions {
+enum {
+    MySuccess = 0,
+    MailAddressNotConfirmed = 1,
+
+    // Library errors
+    LibraryError = 100,
+    NotInitialized = 101,
+    AlreadyInitialized = 102,
+    ErrDesc103 = 103,
+    ErrDesc104 = 104,
+    Busy = 111,
+    ErrDesc112 = 112,
+    NotImplemented = 191,
+    Deprecated = 192,
+    DevelopmentOnly = 193,
+
+    InvalidArgument = 200,
+    InvalidPointer = 201,
+    OutOfRange = 202,
+    InvalidSize = 203,
+    InvalidFormat = 204,
+    InvalidHandle = 205,
+    InvalidValue = 206,
+
+    InternalError = 300,
+    EndOfStream = 301,
+    FileError = 310,
+    FileNotFound = 311,
+    FileVersionMismatch = 312,
+    FileIOError = 313,
+    FileTypeMismatch = 314,
+    ErrDesc315 = 315,
+
+    OutOfResource = 330,
+    ShortOfBuffer = 331,
+    OutOfMemory = 340,
+    OutOfGlobalHeap = 341,
+
+    ErrDesc350 = 350,
+    ErrDesc351 = 351,
+    ErrDesc352 = 352,
+    ErrDesc360 = 360,
+    ErrDesc361 = 361,
+    ErrDesc362 = 362,
+    ErrDesc363 = 363,
+
+    // Account management errors
+    AccountManagementError = 400,
+    AccountNotFound = 401,
+    SlotsFull = 402,
+    AccountNotLoaded = 411,
+    AccountAlreadyLoaded = 412,
+    AccountLocked = 413,
+    NotNetworkAccount = 421,
+    NotLocalAccount = 422,
+    AccountNotCommited = 423,
+
+    ErrDesc431 = 431,
+    ErrDesc432 = 432,
+    ErrDesc433 = 433,
+
+    ErrDesc451 = 451,
+
+    AuthenticationError = 500,
+
+    // HTTP errors
+    HttpError = 501,
+    ErrDesc502 = 502,
+    ErrDesc503 = 503,
+    ErrDesc504 = 504,
+    ErrDesc505 = 505,
+    ErrDesc506 = 506,
+    ErrDesc507 = 507,
+    ErrDesc508 = 508,
+    ErrDesc509 = 509,
+    ErrDesc510 = 510,
+    ErrDesc511 = 511,
+    ErrDesc512 = 512,
+    ErrDesc513 = 513,
+    ErrDesc514 = 514,
+    ErrDesc515 = 515,
+    ErrDesc516 = 516,
+    ErrDesc517 = 517,
+    ErrDesc518 = 518,
+    ErrDesc519 = 519,
+    ErrDesc520 = 520,
+    ErrDesc521 = 521,
+    ErrDesc522 = 522,
+    ErrDesc523 = 523,
+    ErrDesc524 = 524,
+    ErrDesc525 = 525,
+    ErrDesc526 = 526,
+    ErrDesc527 = 527,
+    ErrDesc528 = 528,
+    ErrDesc529 = 529,
+    ErrDesc530 = 530,
+    ErrDesc531 = 531,
+    ErrDesc532 = 532,
+    ErrDesc533 = 533,
+    ErrDesc534 = 534,
+    ErrDesc535 = 535,
+    ErrDesc536 = 536,
+    ErrDesc537 = 537,
+    ErrDesc538 = 538,
+    ErrDesc539 = 539,
+    ErrDesc540 = 540,
+    ErrDesc541 = 541,
+    ErrDesc542 = 542,
+    ErrDesc543 = 543,
+    ErrDesc544 = 544,
+    ErrDesc545 = 545,
+    ErrDesc546 = 546,
+    ErrDesc547 = 547,
+    ErrDesc548 = 548,
+    ErrDesc549 = 549,
+    ErrDesc550 = 550,
+    ErrDesc551 = 551,
+    ErrDesc552 = 552,
+    ErrDesc553 = 553,
+
+    // Request errors
+    RequestError = 600,
+    BadFormatParameter = 601,
+    BadFormatRequest = 602,
+    RequestParameterMissing = 603,
+    WrongHttpMethod = 604,
+
+    // Response errors
+    ResponseError = 620,
+    BadFormatResponse = 621,
+    ResponseItemMissing = 622,
+    ResponseTooLarge = 623,
+
+    // Invalid parameter errors
+    InvalidCommonParameter = 650,
+    InvalidPlatformId = 651,
+    UnauthorizedDevice = 652,
+    InvalidSerialId = 653,
+    InvalidMacAddress = 654,
+    InvalidRegion = 655,
+    InvalidCountry = 656,
+    InvalidLanguage = 657,
+    UnauthorizedClient = 658,
+    DeviceIdEmpty = 659,
+    SerialIdEmpty = 660,
+    PlatformIdEmpty = 661,
+
+    InvalidUniqueId = 671,
+    InvalidClientId = 672,
+    InvalidClientKey = 673,
+
+    InvalidNexClientId = 681,
+    InvalidGameServerId = 682,
+    GameServerIdEnvironmentNotFound = 683,
+    GameServerIdUniqueIdNotLinked = 684,
+    ClientIdUniqueIdNotLinked = 685,
+
+    DeviceMismatch = 701,
+    CountryMismatch = 702,
+    EulaNotAccepted = 703,
+
+    // Update required errors
+    UpdateRequired = 710,
+    SystemUpdateRequired = 711,
+    ApplicationUpdateRequired = 712,
+
+    UnauthorizedRequest = 720,
+    RequestForbidden = 722,
+
+    // Resource not found errors
+    ResourceNotFound = 730,
+    PidNotFound = 731,
+    NexAccountNotFound = 732,
+    GenerateTokenFailure = 733,
+    RequestNotFound = 734,
+    MasterPinNotFound = 735,
+    MailTextNotFound = 736,
+    SendMailFailure = 737,
+    ApprovalIdNotFound = 738,
+
+    // EULA errors
+    InvalidEulaParameter = 740,
+    InvalidEulaCountry = 741,
+    InvalidEulaCountryAndVersion = 742,
+    EulaNotFound = 743,
+
+    // Not acceptable errors
+    PhraseNotAcceptable = 770,
+    AccountIdAlreadyExists = 771,
+    AccountIdNotAcceptable = 772,
+    AccountPasswordNotAcceptable = 773,
+    MiiNameNotAcceptable = 774,
+    MailAddressNotAcceptable = 775,
+    AccountIdFormatInvalid = 776,
+    AccountIdPasswordSame = 777,
+    AccountIdCharNotAcceptable = 778,
+    AccountIdSuccessiveSymbol = 779,
+    AccountIdSymbolPositionNotAcceptable = 780,
+    AccountIdTooManyDigit = 781,
+    AccountPasswordCharNotAcceptable = 782,
+    AccountPasswordTooFewCharTypes = 783,
+    AccountPasswordSuccessiveSameChar = 784,
+    MailAddressDomainNameNotAcceptable = 785,
+    MailAddressDomainNameNotResolved = 786,
+    ErrDesc787 = 787,
+
+    ReachedAssociationLimit = 791,
+    ReachedRegistrationLimit = 792,
+    CoppaNotAccepted = 793,
+    ParentalControlsRequired = 794,
+    MiiNotRegistered = 795,
+    DeviceEulaCountryMismatch = 796,
+    PendingMigration = 797,
+
+    // Wrong user input errors
+    WrongUserInput = 810,
+    WrongAccountPassword = 811,
+    WrongMailAddress = 812,
+    WrongAccountPasswordOrMailAddress = 813,
+    WrongConfirmationCode = 814,
+    WrongBirthDateOrMailAddress = 815,
+    WrongAccountMail = 816,
+
+    AccountAlreadyDeleted = 831,
+    AccountIdChanged = 832,
+    AuthenticationLocked = 833,
+    DeviceInactive = 834,
+    CoppaAgreementCanceled = 835,
+    DomainAccountAlreadyExists = 836,
+
+    AccountTokenExpired = 841,
+    InvalidAccountToken = 842,
+    AuthenticationRequired = 843,
+    ErrDesc844 = 844,
+
+    ConfirmationCodeExpired = 851,
+
+    MailAddressNotValidated = 861,
+    ExcessiveMailSendRequest = 862,
+
+    // Credit card errors
+    CreditCardError = 870,
+    CreditCardGeneralFailure = 871,
+    CreditCardDeclined = 872,
+    CreditCardBlacklisted = 873,
+    InvalidCreditCardNumber = 874,
+    InvalidCreditCardDate = 875,
+    InvalidCreditCardPin = 876,
+    InvalidPostalCode = 877,
+    InvalidLocation = 878,
+    CreditCardDateExpired = 879,
+    CreditCardNumberWrong = 880,
+    CreditCardPinWrong = 881,
+
+    // Ban errors
+    Banned = 900,
+    BannedAccount = 901,
+    BannedAccountAll = 902,
+    BannedAccountInApplication = 903,
+    BannedAccountInNexService = 904,
+    BannedAccountInIndependentService = 905,
+    BannedDevice = 911,
+    BannedDeviceAll = 912,
+    BannedDeviceInApplication = 913,
+    BannedDeviceInNexService = 914,
+    BannedDeviceInIndependentService = 915,
+    BannedAccountTemporarily = 921,
+    BannedAccountAllTemporarily = 922,
+    BannedAccountInApplicationTemporarily = 923,
+    BannedAccountInNexServiceTemporarily = 924,
+    BannedAccountInIndependentServiceTemporarily = 925,
+    BannedDeviceTemporarily = 931,
+    BannedDeviceAllTemporarily = 932,
+    BannedDeviceInApplicationTemporarily = 933,
+    BannedDeviceInNexServiceTemporarily = 934,
+    BannedDeviceInIndependentServiceTemporarily = 935,
+
+    // Service not provided errors
+    ServiceNotProvided = 950,
+    UnderMaintenance = 951,
+    ServiceClosed = 952,
+    NintendoNetworkClosed = 953,
+    NotProvidedCountry = 954,
+
+    // Restriction errors
+    RestrictionError = 970,
+    RestrictedByAge = 971,
+    RestrictedByParentalControls = 980,
+    OnGameInternetCommunicationRestricted = 981,
+
+    InternalServerError = 991,
+    UnknownServerError = 992,
+
+    UnauthenticatedAfterSalvage = 998,
+    AuthenticationFailureUnknown = 999,
+};
+}
+
+namespace ErrCodes {
+enum {
+    MySuccess = 220000,               // 022-0000
+    MailAddressNotConfirmed = 220001, // 022-0001
+
+    // Library errors
+    LibraryError = 220500,       // 022-0500
+    NotInitialized = 220501,     // 022-0501
+    AlreadyInitialized = 220502, // 022-0502
+    ErrCode225103 = 225103,      // 022-5103
+    ErrCode225104 = 225104,      // 022-5104
+    Busy = 220511,               // 022-0511
+    ErrCode225112 = 225112,      // 022-5112
+    NotImplemented = 220591,     // 022-0591
+    Deprecated = 220592,         // 022-0592
+    DevelopmentOnly = 220593,    // 022-0593
+
+    InvalidArgument = 220600, // 022-0600
+    InvalidPointer = 220601,  // 022-0601
+    OutOfRange = 220602,      // 022-0602
+    InvalidSize = 220603,     // 022-0603
+    InvalidFormat = 220604,   // 022-0604
+    InvalidHandle = 220605,   // 022-0605
+    InvalidValue = 220606,    // 022-0606
+
+    InternalError = 220700,       // 022-0700
+    EndOfStream = 220701,         // 022-0701
+    FileError = 220710,           // 022-0710
+    FileNotFound = 220711,        // 022-0711
+    FileVersionMismatch = 220712, // 022-0712
+    FileIOError = 220713,         // 022-0713
+    FileTypeMismatch = 220714,    // 022-0714
+    ErrCode225315 = 225315,       // 022-5315
+
+    OutOfResource = 220730,   // 022-0730
+    ShortOfBuffer = 220731,   // 022-0731
+    OutOfMemory = 220740,     // 022-0740
+    OutOfGlobalHeap = 220741, // 022-0741
+
+    ErrCode225350 = 225350, // 022-5350
+    ErrCode225351 = 225351, // 022-5351
+    ErrCode225352 = 225352, // 022-5352
+    ErrCode225360 = 225360, // 022-5360
+    ErrCode225361 = 225361, // 022-5361
+    ErrCode225362 = 225362, // 022-5362
+    ErrCode225363 = 225363, // 022-5363
+
+    // Account management errors
+    AccountManagementError = 221000, // 022-1000
+    AccountNotFound = 221001,        // 022-1001
+    SlotsFull = 221002,              // 022-1002
+    AccountNotLoaded = 221011,       // 022-1011
+    AccountAlreadyLoaded = 221012,   // 022-1012
+    AccountLocked = 221013,          // 022-1013
+    NotNetworkAccount = 221021,      // 022-1021
+    NotLocalAccount = 221022,        // 022-1022
+    AccountCommited = 221023,        // 022-1023
+
+    ErrCode225431 = 225431, // 022-5431
+    ErrCode225432 = 225432, // 022-5432
+    ErrCode225433 = 225433, // 022-5433
+
+    ErrCode221101 = 221101, // 022-1101
+
+    AuthenticationError = 222000, // 022-2000
+
+    // HTTP errors
+    HttpError = 222100,     // 022-2100
+    ErrCode225502 = 225502, // 022-5502
+    ErrCode225503 = 225503, // 022-5503
+    ErrCode225504 = 225504, // 022-5504
+    ErrCode225505 = 225505, // 022-5505
+    ErrCode225506 = 225506, // 022-5506
+    ErrCode225507 = 225507, // 022-5507
+    ErrCode225508 = 225508, // 022-5508
+    ErrCode225509 = 225509, // 022-5509
+    ErrCode225510 = 225510, // 022-5510
+    ErrCode225511 = 225511, // 022-5511
+    ErrCode225512 = 225512, // 022-5512
+    ErrCode225513 = 225513, // 022-5513
+    ErrCode225514 = 225514, // 022-5514
+    ErrCode225515 = 225515, // 022-5515
+    ErrCode225516 = 225516, // 022-5516
+    ErrCode225517 = 225517, // 022-5517
+    ErrCode225518 = 225518, // 022-5518
+    ErrCode225519 = 225519, // 022-5519
+    ErrCode225520 = 225520, // 022-5520
+    ErrCode225521 = 225521, // 022-5521
+    ErrCode225522 = 225522, // 022-5522
+    ErrCode225523 = 225523, // 022-5523
+    ErrCode225524 = 225524, // 022-5524
+    ErrCode225525 = 225525, // 022-5525
+    ErrCode225526 = 225526, // 022-5526
+    ErrCode225527 = 225527, // 022-5527
+    ErrCode225528 = 225528, // 022-5528
+    ErrCode225529 = 225529, // 022-5529
+    ErrCode225530 = 225530, // 022-5530
+    ErrCode225531 = 225531, // 022-5531
+    ErrCode225532 = 225532, // 022-5532
+    ErrCode225533 = 225533, // 022-5533
+    ErrCode225534 = 225534, // 022-5534
+    ErrCode225535 = 225535, // 022-5535
+    ErrCode225536 = 225536, // 022-5536
+    ErrCode225537 = 225537, // 022-5537
+    ErrCode225538 = 225538, // 022-5538
+    ErrCode225539 = 225539, // 022-5539
+    ErrCode225540 = 225540, // 022-5540
+    ErrCode225541 = 225541, // 022-5541
+    ErrCode225542 = 225542, // 022-5542
+    ErrCode225543 = 225543, // 022-5543
+    ErrCode225544 = 225544, // 022-5544
+    ErrCode225545 = 225545, // 022-5545
+    ErrCode225546 = 225546, // 022-5546
+    ErrCode225547 = 225547, // 022-5547
+    ErrCode225548 = 225548, // 022-5548
+    ErrCode225549 = 225549, // 022-5549
+    ErrCode225550 = 225550, // 022-5550
+    ErrCode225551 = 225551, // 022-5551
+    ErrCode225552 = 225552, // 022-5552
+    ErrCode225553 = 225553, // 022-5553
+
+    // Request errors
+    RequestError = 222400,            // 022-2400
+    BadFormatParameter = 222401,      // 022-2401
+    BadFormatRequest = 222402,        // 022-2402
+    RequestParameterMissing = 222403, // 022-2403
+    WrongHttpMethod = 222404,         // 022-2404
+
+    // Response errors
+    ResponseError = 222420,       // 022-2420
+    BadFormatResponse = 222421,   // 022-2421
+    ResponseItemMissing = 222422, // 022-2422
+    ResponseTooLarge = 222423,    // 022-2423
+
+    // Invalid parameter errors
+    InvalidCommonParameter = 222450, // 022-2450
+    InvalidPlatformId = 222451,      // 022-2451
+    UnauthorizedDevice = 222452,     // 022-2452
+    InvalidSerialId = 222453,        // 022-2453
+    InvalidMacAddress = 222454,      // 022-2454
+    InvalidRegion = 222455,          // 022-2455
+    InvalidCountry = 222456,         // 022-2456
+    InvalidLanguage = 222457,        // 022-2457
+    UnauthorizedClient = 222458,     // 022-2458
+    DeviceIdEmpty = 222459,          // 022-2459
+    SerialIdEmpty = 222460,          // 022-2460
+    PlatformIdEmpty = 222461,        // 022-2461
+
+    InvalidUniqueId = 222471,  // 022-2471
+    InvalidClientId = 222472,  // 022-2472
+    InvalidClientKey = 222473, // 022-2473
+
+    InvalidNexClientId = 222481,              // 022-2481
+    InvalidGameServerId = 222482,             // 022-2482
+    GameServerIdEnvironmentNotFound = 222483, // 022-2483
+    GameServerIdUniqueIdNotLinked = 222484,   // 022-2484
+    ClientIdUniqueIdNotLinked = 222485,       // 022-2485
+
+    DeviceMismatch = 222501,  // 022-2501
+    CountryMismatch = 222502, // 022-2502
+    EulaNotAccepted = 222503, // 022-2503
+
+    // Update required errors
+    UpdateRequired = 222510,            // 022-2510
+    SystemUpdateRequired = 222511,      // 022-2511
+    ApplicationUpdateRequired = 222512, // 022-2512
+
+    UnauthorizedRequest = 222520, // 022-2520
+    RequestForbidden = 222522,    // 022-2522
+
+    // Resource not found errors
+    ResourceNotFound = 222530,     // 022-2530
+    PidNotFound = 222531,          // 022-2531
+    NexAccountNotFound = 222532,   // 022-2532
+    GenerateTokenFailure = 222533, // 022-2533
+    RequestNotFound = 222534,      // 022-2534
+    MasterPinNotFound = 222535,    // 022-2535
+    MailTextNotFound = 222536,     // 022-2536
+    SendMailFailure = 222537,      // 022-2537
+    ApprovalIdNotFound = 222538,   // 022-2538
+
+    // EULA errors
+    InvalidEulaParameter = 222540,         // 022-2540
+    InvalidEulaCountry = 222541,           // 022-2541
+    InvalidEulaCountryAndVersion = 222542, // 022-2542
+    EulaNotFound = 222543,                 // 022-2543
+
+    // Not acceptable errors
+    PhraseNotAcceptable = 222570,                  // 022-2570
+    AccountIdAlreadyExists = 222571,               // 022-2571
+    AccountIdNotAcceptable = 222572,               // 022-2572
+    AccountPasswordNotAcceptable = 222573,         // 022-2573
+    MiiNameNotAcceptable = 222574,                 // 022-2574
+    MailAddressNotAcceptable = 222575,             // 022-2575
+    AccountIdFormatInvalid = 222576,               // 022-2576
+    AccountIdPasswordSame = 222577,                // 022-2577
+    AccountIdCharNotAcceptable = 222578,           // 022-2578
+    AccountIdSuccessiveSymbol = 222579,            // 022-2579
+    AccountIdSymbolPositionNotAcceptable = 222580, // 022-2580
+    AccountIdTooManyDigit = 222581,                // 022-2581
+    AccountPasswordCharNotAcceptable = 222582,     // 022-2582
+    AccountPasswordTooFewCharTypes = 222583,       // 022-2583
+    AccountPasswordSuccessiveSameChar = 222584,    // 022-2584
+    MailAddressDomainNameNotAcceptable = 222585,   // 022-2585
+    MailAddressDomainNameNotResolved = 222586,     // 022-2586
+    ErrCode222587 = 222587,                        // 022-2587
+
+    ReachedAssociationLimit = 222591,   // 022-2591
+    ReachedRegistrationLimit = 222592,  // 022-2592
+    CoppaNotAccepted = 222593,          // 022-2593
+    ParentalControlsRequired = 222594,  // 022-2594
+    MiiNotRegistered = 222595,          // 022-2595
+    DeviceEulaCountryMismatch = 222596, // 022-2596
+    PendingMigration = 222597,          // 022-2597
+
+    // Wrong user input errors
+    WrongUserInput = 222610,                    // 022-2610
+    WrongAccountPassword = 222611,              // 022-2611
+    WrongMailAddress = 222612,                  // 022-2612
+    WrongAccountPasswordOrMailAddress = 222613, // 022-2613
+    WrongConfirmationCode = 222614,             // 022-2614
+    WrongBirthDateOrMailAddress = 222615,       // 022-2615
+    WrongAccountMail = 222616,                  // 022-2616
+
+    AccountAlreadyDeleted = 222631,      // 022-2631
+    AccountIdChanged = 222632,           // 022-2632
+    AuthenticationLocked = 222633,       // 022-2633
+    DeviceInactive = 222634,             // 022-2634
+    CoppaAgreementCanceled = 222635,     // 022-2635
+    DomainAccountAlreadyExists = 222636, // 022-2636
+
+    AccountTokenExpired = 222641,    // 022-2641
+    InvalidAccountToken = 222642,    // 022-2642
+    AuthenticationRequired = 222643, // 022-2643
+    ErrCode225844 = 225844,          // 022-5844
+
+    ConfirmationCodeExpired = 222651, // 022-2651
+
+    MailAddressNotValidated = 222661,  // 022-2661
+    ExcessiveMailSendRequest = 222662, // 022-2662
+
+    // Credit card errors
+    CreditCardError = 222670,          // 022-2670
+    CreditCardGeneralFailure = 222671, // 022-2671
+    CreditCardDeclined = 222672,       // 022-2672
+    CreditCardBlacklisted = 222673,    // 022-2673
+    InvalidCreditCardNumber = 222674,  // 022-2674
+    InvalidCreditCardDate = 222675,    // 022-2675
+    InvalidCreditCardPin = 222676,     // 022-2676
+    InvalidPostalCode = 222677,        // 022-2677
+    InvalidLocation = 222678,          // 022-2678
+    CreditCardDateExpired = 222679,    // 022-2679
+    CreditCardNumberWrong = 222680,    // 022-2680
+    CreditCardPinWrong = 222681,       // 022-2681
+
+    // Ban errors
+    Banned = 222800,                                       // 022-2800
+    BannedAccount = 222801,                                // 022-2801
+    BannedAccountAll = 222802,                             // 022-2802
+    BannedAccountInApplication = 222803,                   // 022-2803
+    BannedAccountInNexService = 222804,                    // 022-2804
+    BannedAccountInIndependentService = 222805,            // 022-2805
+    BannedDevice = 222811,                                 // 022-2811
+    BannedDeviceAll = 222812,                              // 022-2812
+    BannedDeviceInApplication = 222813,                    // 022-2813
+    BannedDeviceInNexService = 222814,                     // 022-2814
+    BannedDeviceInIndependentService = 222815,             // 022-2815
+    BannedAccountTemporarily = 222821,                     // 022-2821
+    BannedAccountAllTemporarily = 222822,                  // 022-2822
+    BannedAccountInApplicationTemporarily = 222823,        // 022-2823
+    BannedAccountInNexServiceTemporarily = 222824,         // 022-2824
+    BannedAccountInIndependentServiceTemporarily = 222825, // 022-2825
+    BannedDeviceTemporarily = 222831,                      // 022-2831
+    BannedDeviceAllTemporarily = 222832,                   // 022-2832
+    BannedDeviceInApplicationTemporarily = 222833,         // 022-2833
+    BannedDeviceInNexServiceTemporarily = 222834,          // 022-2834
+    BannedDeviceInIndependentServiceTemporarily = 222835,  // 022-2835
+
+    // Service not provided errors
+    ServiceNotProvided = 222880,    // 022-2880
+    UnderMaintenance = 222881,      // 022-2881
+    ServiceClosed = 222882,         // 022-2882
+    NintendoNetworkClosed = 222883, // 022-2883
+    NotProvidedCountry = 222884,    // 022-2884
+
+    // Restriction errors
+    RestrictionError = 222900,                      // 022-2900
+    RestrictedByAge = 222901,                       // 022-2901
+    RestrictedByParentalControls = 222910,          // 022-2910
+    OnGameInternetCommunicationRestricted = 222911, // 022-2911
+
+    InternalServerError = 222931, // 022-2931
+    UnknownServerError = 222932,  // 022-2932
+
+    UnauthenticatedAfterSalvage = 222998,  // 022-2998
+    AuthenticationFailureUnknown = 222999, // 022-2999
+    Unknown = 229999,                      // 022-9999
+};
+}
+
+/// Gets the ACT error code for the given result
+u32 GetACTErrorCode(Result result);
+
+} // namespace Service::ACT
diff --git a/src/core/hle/service/act/act_u.cpp b/src/core/hle/service/act/act_u.cpp
index d28c3b07f..a55c303c1 100644
--- a/src/core/hle/service/act/act_u.cpp
+++ b/src/core/hle/service/act/act_u.cpp
@@ -11,10 +11,31 @@ ACT_U::ACT_U(std::shared_ptr<Module> act) : Module::Interface(std::move(act), "a
     static const FunctionInfo functions[] = {
         // clang-format off
         {0x0001, &ACT_U::Initialize, "Initialize"},
-        {0x0002, nullptr, "GetErrorCode"},
-        {0x0006, &ACT_U::GetAccountDataBlock, "GetAccountDataBlock"},
+        {0x0002, &ACT_U::GetErrorCode, "GetErrorCode"},
+        {0x0003, nullptr, "GetLastResponseCode"},
+        {0x0005, nullptr, "GetCommonInfo"},
+        {0x0006, &ACT_U::GetAccountInfo, "GetAccountInfo"},
+        {0x0007, nullptr, "GetResultAsync"},
+        {0x0008, nullptr, "GetMiiImageData"},
+        {0x0009, nullptr, "SetNfsPassword"},
         {0x000B, nullptr, "AcquireEulaList"},
+        {0x000C, nullptr, "AcquireTimeZoneList"},
         {0x000D, nullptr, "GenerateUuid"},
+        {0x000F, nullptr, "FindSlotNoByUuid"},
+        {0x0010, nullptr, "SaveData"},
+        {0x0011, nullptr, "GetTransferableId"},
+        {0x0012, nullptr, "AcquireNexServiceToken"},
+        {0x0013, nullptr, "GetNexServiceToken"},
+        {0x0014, nullptr, "AcquireIndependentServiceToken"},
+        {0x0015, nullptr, "GetIndependentServiceToken"},
+        {0x0016, nullptr, "AcquireAccountInfo"},
+        {0x0017, nullptr, "AcquireAccountIdByPrincipalId"},
+        {0x0018, nullptr, "AcquirePrincipalIdByAccountId"},
+        {0x0019, nullptr, "AcquireMii"},
+        {0x001A, nullptr, "AcquireAccountInfoEx"},
+        {0x001D, nullptr, "InquireMailAddress"},
+        {0x001E, nullptr, "AcquireEula"},
+        {0x001F, nullptr, "AcquireEulaLanguageList"},
         // clang-format on
     };
     RegisterHandlers(functions);