Platform: PC through the Xbox game pass.
Problem: friend can't connect to game anymore; either he gets "cannot connect to game" when trying to join, or he joins and it kicks him out a few seconds later with no error.
Repro: me & 1 friend have been playing this game in multiplayer since the start of the save (i host, he joins). it's been fine for months.
the last time we played, we had just powered up a gateway chamber on Novus. we saved & quit. when we next logged in, the gateway was lit up/completed for me but not for him. he had a bunch of problems (random death to nothing, got DCed a bunch of times, couldn't interact with things etc). he tried relogging a few times and i restarted the game a bunch of times, but it reached a point where he couldn't stay in the game for longer than a few seconds before kicking him. we assume its a desync problem due to the gateway being in different states on his pc vs mine.
my character is now stuck on a planet with no rocket ship or teleport points (we lost the ship in space due to him DCing when trying to fly to another planet), and my friend's character can't log in, so the game is basically ended for us now.
Attempted fixes: he tried removing local data, completely uninstalling & reinstalling the game, we both tried making sure our xbox networking was working (it seems to think it's fine and we ran through troubleshoot guides, and its working ok on other games)
let me know if i can provide any more info, or if there's any workarounds we can try to get the save file working for us both again. cheers