Changing a boolean across multiple instances of an actor

I am attempting to make a simple tic tac toe game that has clickable areas (the multiple instances of the actor). I am attempting to swap the boolean back and forth when a clickable area is clicked. I cannot seem to get this to work consistantly. Any ideas?

How do you determine which actor you clicked on?

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I made a blueprint of an invisible cube and placed them in the rows and columns of the game board. I then labeled them R1C1, R1C2 and so on. It’s a 3x3 grid.

What directly triggers the logic for changing the value of a variable? What does “I clicked on this cube” say?
Can you take a screenshot?