I attached my AIController (BP_EnemyAI) to my Character Blueprint (BP_EnemyCharacter) but the events I add in the AIController blueprint (like BeginPlay, Keyboard key events, Tick) are never called.
The Character Blueprint (BP_EnemyCharacter) default settings:
Input F in AI Controller will never get called because it has no Input in first place. Second, the way you use Timer is wrong. Timer Events must not have any inputs.
My favorite is using Set Timer By Event like this: