Ok, **I have fixed the problem :)**but I have a different issue:
the sound itself isn’t directional (is always played at full volume) so you always hear it as if the other player was up close to you instead of changing volume based on the distance between 2 players.
This is the current blueprint:
http://puu.sh/c25kX/51ecf47059.
Hopefully we can close in on this issue.