2 Players Viewport Client Blackscreen

Hey,
I got a problem with one of my maps, or Characters (noot sure where exactly the problem lies):

If I select 2 Players and click play in viewport, just one (the host character) spawns. The client has a black screen.

When the game starts, normally the character creation pops up automaticly [1], but the client doesnt shows it.

I got some other maps with diffrent Gamemodes and diffrent PC’s/Characters. Those work fine, so I believe the problem should be in the specific Gamemode/PC/Character for that Map.

I think it could be, that the client doesnt get a playercontroller, but I dont know how to check or fix it.

I appreciate your help: