New answers tagged xbox-live
Have you tried adding them to the game without having them in an Xbox LIVE Party? Some gamemodes don't allow large party sizes due to the team size.
I'm not sure how to enable it, but it is possible to be logged in to Xbox Live and appear offline. This will hide your current activity from anyone on your friends list. Since you are connected to Xbox Live, this lets you do anything that requires Xbox Live as usual (playing multiplayer, sending messages, etc.).
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