Back again
So I did what you suggested, and indeed it works fine. Everyone connecting to the game spawn as a spectator and only the host can possess the character pawn.
Now I struggle with the first person camera thing.
I tried to create an camera actor, and then to attach it to my playable character pawn. Obviously it’s tied to the mesh and not the actual camera of the character pawn.
So far I was unable to replicate the camera view of my playable character pawn to the other camera actor.
Any idea?