Bind Delegate inside an event won't trigger

Development Programming & Scripting C++
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1

I’m trying to bind a delegate inside an overlap event where with a door.

  1. Player walks in Door’s proximity
  2. OverlapEvent triggers
  3. User gets a reference to the Door (DoorReference member is subclass of ATriggerBox )
  4. BindUObject on DoorReference delegate OnPuzzleSuccess
  5. Solve the puzzle
  6. If correct ExecuteIfBound the user function.

All good till step 5. Afterwards no delegate is called. Upon checking the delegate if isBound I get true immediately after step 4. but false before step 6.

Do I have to bind Delegates inside BeginPlay() ?

DoorTrigger.h

.
.
.
DECLARE_DELEGATE_OneParam(FPuzzleSuccess, AInteractableItem *);

UCLASS()
class SOME_API ADoorTrigger : public ATriggerBox
{
public:

	FPuzzleSuccess OnPuzzleSuccess;
  
        UFUNCTION(BlueprintCallable)
        void HandleSuccessCompletion();
.
.
.
  }

DoorTrigger.cpp

void ADoorTrigger::HandleSuccessCompletion()
{
	if (OnSuccessCompletion.IsBound()) {
		GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, TEXT("it is bound"));

	}
	OnSuccessCompletion.ExecuteIfBound(this->SuccessPrize);
}


void ADoorTrigger::onComboSubmission(bool isCorrect)
{
	if (isCorrect) {
		// do stuff
		HandleSuccessCompletion(); // call the delegate
	}
	else {
		GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, TEXT("Nope"));
	}
}

Player.cpp

... 
void APlayer::OnOverlapBegin(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
	if (OtherActor->IsA(ADoorTrigger::StaticClass())) {
	
		DoorReference = Cast<ADoorTrigger>(OtherActor);
				
		DoorReference->OnSuccessCompletion.BindUObject(this, &APlayer::OnPuzzleSuccess);  // OnPuzzleSuccess has the UFUNCTION MACRO
	}
}

void APlayer::OnPuzzleSuccess(AInteractableItem* Prize)
{
	if (DoorReference) {
		InventoryComponent->AddItem(Prize);
    }
}