So I just logged into mcc on my xbox 1 and after finishing a couple campaign missions for Halo Reach I decide to play Online to rank up then im banned for one week.Note that I have not played in 2 days.
Dont know if this is a good answer, but you might’ve left your game on and it might of matchmade. Idk
Bans for 1 week mean your account has been caught AFKing, Swordlining or Macroing. See my post here for further details: https://www.halowaypoint.com/en-us/forums/84ad72a8b51847978545f685f651fc15/topics/the-official-halo-mcc-why-was-i-banned-thread/95de2d50-5e10-42db-9490-c24efbd2dc74/posts?page=83#post1648