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ok, so, i dont mean to undermine anything xxblink182xx posted, but with the help of some friends, we found a faster way to make the invites work so that you dont have to delete and re-add people every time you get on the game.
1. send an invite to the person you want to have join your party
2. after you have sent the invite, tell that person sign out and sign back in
3. have them accept your invite after signing back in
this should make the invite work.