I write for my partner, the names of the records bear my name.
I have reviewed all the packages of the game and everything is packaged, in fact it is possible to join as follows:
Host user creates a session
Client user right-clicks on steam and show join to game
Host user writes in console: open map?listen
Client user joins the session from steam
Both users can play.
If once both players connected the host uses the servertravel command the client will give timeout, I have tried exactly the same process with the game in a previous version in Unreal Engine 4 and this error does not occur, it seems something exclusively from Unreal Engine 5, in our case Unreal Engine 5.0.3
We are using Advanced sessions, although I think it is not the problem here since the session is created well and players can be joined without problems, there is a problem when traveling between maps and I think it could have to do with OnlineSubSystem, I am not sure if perhaps the problem comes from OnlineSubsystemSteam but I do not think since you achieve, DLC’s etc I can access them without problem.