I am having the annoying bug where you need to login to play multiplayer, but after I choose ok to login it acts like it wants to but then just defaults back to the main screen and doesn't offer the login screen.  I have had this issue numerous times in the past (super annoying) but usually you can just login and play the game but not today.

im having the same issue.  Been playing now with a friend for a couple days and all of a sudden its not logging in.  Ive tried everything I can think of.  Im currently gonna try to download the xbox game pass version and see if this works because I currently using steam version.  I sent an email to Obsidian.