Multiplayer, can't apply dammage

I have a really annoying problem here, so I’m trying to apply damage to another player in my multiplayer test world, but it won’t apply the damage. What’s weird here is that the particle is spawning at the actor location so I know that it is the right actor.
If I connect the collision box directly to apply damage it works, so how could I fix it?

I have also tried to connect the begin overlap and end overlap to open/close and left mouse button pressed to enter in the gate but the same problem.