By default only the controller and character receive player input. The easy bypass would be to set “player input” in the defaults of your BP to “Player 0”. That way it will receive input from the first player which works just fine for a singleplayer.
However for clean coding I would suggest catching the event in your character (or even controller) and then firing the event in any third actor via casts or saved values (e.g. if you pick up a cube. Save a reference to it in a “Picked up” actor variable).
You can not only use the same function from your character to do multiple things with different actors but you also won’t even wonder why something is doing something weird if you press button x because you handle all inputs in your controller (and maybe your character itself).
Debugging just gets easier. And reading that code as well… quite a lot!