I am having the same issue as here: Steam Multiplayer with more than two players
However, when I package the game and run on 3 seperate computers with separate steam accounts I still encounter this error. Do I have to package the game as “Shipping” instead of “Development”? Not sure what I am missing for it to be non-debug mode for steam.
Also, I am using My own AppID, so problems with ID 480 shouldn’t be a problem.