I’m still not sure why this wasn’t working properly, but I have a very suitable work around for my purposes. I have added Anim_Notifies on the attack animations themselves that trigger the event. It works perfectly.
This is the documentation that helped me:
https://docs.unrealengine.com/latest/INT/Engine/Animation/Sequences/Notifies/
I am going to be marking this as answered since I no longer need help.