(Blueprint / MP) Client Possession or Input not working

Anyone got another idea?

I tried redoing my server setup and join to be sure that its not caused by that. Didnt work.

I noticed that the Server itself does indeed register actions by the client. “Hover over” or “on click” events do trigger, but all the commands going through the player controller / the camera pawn dont do anything. Do i have to take something else into account when possessing? Is there something i dont see/ know?