I haven’t seen any posts on any website with people that have had issues with this, but I tried joining matchmaking in “social games” with a friend of mine the other day (a total of two of us in a party) and we were not able to join any game (slayer, action sack, swat, etc.) on any game mode. The only game/lobby size we were able to join was doubles (not able to join 4v4 or 6v6).
Why is this? This seems like a very simple, simple issue.