I am trying to use 1 interface to communicate between an actor and a character enemy.
I have set up a message in the actor and added the interface event to my enemy. However I also added the interface event to the player character to use the interface but only the event for the enemy seems to work. I have implemented both interfaces for the blueprints.
When using blueprint interfaces, actors can’t send and receive at the same time. They can be one or the other.
There are many ways to have actors “communicate.” The documentation is a good start: Actor Communication | Unreal Engine Documentation
AFAIK, when sending messages via interface you usually target an actor with that interface in the message node. Did you target the Player character in the message node as well?
Correction: Same blueprint can send and recieve via blueprint interface, just tried to send and specified “self” in target object. 
The link is very usefull.