Just a hint: “Please dont waste time doing videos to provide us a debug media. Only do videos in case you want to demonstrate your visible issue.”
In any other cases post screenshots instead, because people like me like to analyse without being forced to click every second on your video.
However, what i have seen, seems to be related to your delegate binding (ButtonWasClicked) (Could only be one issue, there may be more).
Inside your video where you send the delegate message, it seems that no receiver was found. The thing that it worked in the tutorial, was probably the version of the engine back then.
And i believe that they changed delegates in further versions.
please show us your delegate binding as screenshots please
cheers