We currently have two issues that we're working on fixes for with our match making. We've provided workarounds for the two problems players are experiencing.
Storm Server Unreachable / Game reservation failed / No Servers Issue- Start a "PLAY -> Training -> Bots Team Deathmatch" game and leave the match it to clear this error if this error appears more than a few times. We're investigating why it happens and thank you for your continued patience.
Cannot join friends that are in your party - Use the Left Bumper to bring up the friends list at the Main Menu, then select your friend already in a match, then select "Join Server" to join your friends' game directly as opposed to creating a party. We're implementing a proper fix for this functionality in a future hot fix.