if someone doesn't accept your invite for a game , go to 24/7 multiplayer and play a 2 on 2. Once you and the other person agree on that game , your phone list will come and you can pick any one from your phone list you want. After the game save then when you play 1 player 24/7 then play a 2 on 2 , the check will still be on the person you selected during the multiplayer game and doesn't matter whether they accept your invite or not.
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