I’m having a devil of a time getting this working myself! When I try the same thing, the compiler complains that I’m providing too many arguments:
|Error|C2660|'UEnhancedInputComponent::BindAction': function does not take 5 arguments
Is this something you ran into during your aforementioned 9 unsuccessful attempts? 
I just want one little payload, dangit!
Note: I am on 4.26, perhaps the feature is just newer than the version I’m using…