Im a huge follower of Dani and I actually was really bumped down when I saw Dani's attempt of Among Us 3D because I made this two weeks ago but didn't had the chance of finishing it... Thanks for the comment, really appreciate it!
So I kept my server running for hours and randomly 2 people joined at two different points in time. But now I'm trying to get people to join and it doesn't work. Does a certain port have to be open for this to work? 5055 (photon default) does not seem to work.
PS: We were able to figure out the problem - regions are determined automatically. Forcing it to for example "us" allows US player to join EU host though.