If a party exceeds the maximum average MMR, then they are unable to party together. This may help limit top players in the server teaming and "smurfing" against others in the queue.
ex. Set a party MMR average limit of 1000 MMR
- Player 1 has 1600 MMR & Player 2 has 1200 MMR, since the average Party MMR is 1400 then they can't party together