I do see that its a global transition, but does it have a checkmark in the event list?
If so, did the event call get set up with gamemanager before gamemanager got prefabed? If you made it a prefab after, it might be trying to communicate with the wrong object.
If else, put a lock on the FSM and press play to make sure its not actually being called, but addscore isn't doing what you want it to for whatever reason.