Cast to a Blueprint Actor

In your first person character create a variable. Change the Variable type to the NAME of your BP Class Actor in the scene (Variable Name drop down).

Create a Function inside of your BP Class Actor … call it “testfunction” or whatever and compile

Inside your FPC again, Right click and type in the name of that function.

The target input of that new function is your Variable you created above.
The Character is Self.

Try that.

Jerry