When i trying to join my friends, game say "The game you have tried to join is no longer available" but when i join to random its work perfectly, and i have same problem at DL1. This problems have all my friends.
#Problem with CO-OP
minor escarp
sage raven
having same problem
fast panther
it happened for me any my friend. to solve this problem u both need to right click game - press properties - game files - verify game files. because someone of u didn't got all the files when downloaded the game or updating game. that will solve the problem since it did for me and my friend