the same thing happened to me. im pretty sure one of you guys has version 3.1 and the other has version 1.0 the easiest way is for you both to be on version 3.1
one way you can check is by uninstalling and reinstalling the game. recently the game went through a few updates and this also helped me out. unless you already tried that lmao
I recently tried to play the game with a friend and it also wasn't working. Then we tried with a fresh build and it seems to have fixed the issue, even though I don't think I changed anything that should affect networking. I just uploaded that new build so that you can try it too.
