Same problem here, we have been playing online FM23 with a couple of friends for a long time now and in the last 2-3 days, there is a problem in the join online page(where you join the network game). My friend can see the network game(which I set up) but when he clicks the game and chooses join, there is a warning which pops up saying "Unable to join server". We play the game over Steam platform. Can somebody explain why this is happening? Any ideas on roughly when this problem will be solved?