Capturing Actor overlapping not working

Hi everybody,
I’m a new to UE4,
I’m following video tutorials on programming C++ with UE4,
And I can’t seem to get anything with capturing Actor Objects overlapping to work.

I doesn’t work for me here’ in the Battery Collector tutorial:
The “GetOverlappingActors” doesn’t produce results,
This is the code:

TArray<AActor*> CollectedActors;

And it also doesn’t work for me in another tutprial:

tBox->bGenerateOverlapEvents = true;
tBox->OnComponentBeginOverlap.AddDynamic(this, &AMyActor::TriggerEnter);

Any Ideas why?
I tried both tutorials in UE 4.10 and in UE 4.11

Thanks for any reply,