I can't group up with people. It's always "failed to join group". I can play against people as soloplayer though.
Am I the only one with this issue?

For little bit background knowledge: I'm in a student apartment where I don't have access to the main router. I can play games like Battlefield 1 which has dedicated servers without any problems. Is this a p2p problem!? I had the same issue with Street Fighter V too.