NTE co-op matchmaking not finding teammates? Fix

1) Confirm you've unlocked co-op (requires certain main story progress) 2) Check your World Level — higher levels have smaller matchmaking pools 3) Try lowering matchmaking requirements 4) Post in chat channels to invite teammates directly 5) Have friends invite you via UID 6) Avoid low-activity hours like late night 7) Check your network connection. Some dungeons need to be unlocked before co-op is available.