Steam multiplayer can't join lobby

Hi. I’m making a local host multiplayer game that uses steam networking with Mirror.

Everything seems fine at first. Player1 creates the game and Player2 joins to Player1 via Steam Friends. However, if they return to MainMenu and Player2 decides to create the game Player1 can’t join the game.

Basically, if a player hosts a game session and others join, all players can only join that host. Sometimes restarting steam fixes that problem sometimes not.

I hope you can help. Thanks in advance.

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