Won't Let Me Join Multiplayer

I was loading up a game of Warzone Firefight then the game crashed. Once I loaded up the game everything in Arena and Warzone says “Could not find a server suitable for all members of your fireteam” and I’m all alone. What is wrong?

It now let me join after closing the game three or four times.

I for one see two different things that have prevented me from wanting to play. I recently finished my download of the halo latest update and yet I still see “could not find a server suitable for your fireteam” but I’m alone too. I don’t understand. I also see matchmaking ban rules for misconduct. Excuse me, but I have no recollection of doing anything naughty.