The past few times my friends have come over, we have tried to get the Halo 3 vidmaster challenge done. However whenever we try to start a game with 4 player splitscreen campaign the error message, “Your settings dont allow this setup” appears. Any help would be much appreciated. Keep in mind this is still after the MCC fix update.
Halo 3 only supports 2 player local co-op.
This doesn’t have anything to do with the update. Halo 3 only allowed 2-player split screen. You will have to connect wit 2 other players over Live to get that achievement.