Still unable to play online whatsoever

I received the master chief collection on christmas as a digital download with my xbox one. I have the game fully installed and all wifi connection aspects configured properly, yet I still have not been able to join a single match in matchmaking. I’ve tried every game type, I’ve sat in connection lobbies 20 minutes at a time, i’ve checked my NAT settings and fixed them, but nothing is allowing me to join a match. Is there any way possible I could get help?

change your NAT to open.