UE5 Enhanced Input: Subsystem reports "Mapping Context Added" but Debugger says "No mappings applied"

I am developing a game in Unreal Engine 5 (running on macOS with JetBrains Rider) and I'm running into a silent failure with the Enhanced Input system.

The Problem: My C++ logic for adding an Input Mapping Context (IMC) appears to execute correctly, and my logs confirm that the subsystem is valid and the AddMappingContext function is called. However, the inputs are not detected in-game.

Diagnostic Data: When running the console command showdebug enhancedinput, the debug overlay shows:

"No enhanced player input action mappings have been applied to this input."

My Code: I am currently adding the context in PawnClientRestart to ensure the controller is fully possessed:

void ATank::PawnClientRestart() { Super::PawnClientRestart(); if (APlayerController* PC = Cast<APlayerController>(GetController())) { if (UEnhancedInputLocalPlayerSubsystem* Subsystem = ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(PC->GetLocalPlayer())) { if (DefaultMappingContext) { Subsystem->ClearAllMappings(); Subsystem->AddMappingContext(DefaultMappingContext, 0); UE_LOG(LogTemp, Warning, TEXT("TANK WIRED: Context added successfully!")); } } } }

What I have verified:

Project Settings: Both Default Player Input Class and Default Input Component Class are set to the Enhanced versions.

Blueprint: The DefaultMappingContext variable is correctly assigned to an IMC asset in the Details panel of my Pawn.

Input Action: The IA_Move asset is set to Digital (bool) and the C++ function signature matches exactly.

Outliner: I only have one instance of the Pawn in the world (spawned via Player Start).

Clean Build: I have deleted Binaries and Intermediate and rebuilt the project from Rider.

Despite the UE_LOG firing and confirming the code reaches the subsystem, the debugger insists no mappings are applied. Why would the UEnhancedInputLocalPlayerSubsystem report a successful addition but fail to actually apply the mappings to the possessed Pawn?

Tags: unreal-engine c++ unreal-engine-5 enhanced-input