Can't connect with my friend to play halo MCC, both on Xbox. what can I do?

I was told the warthog codes were sent out 4 of my friends have received it I have yet to when will I see it I have played and own both Halo 5 and Halo MCC

Lately I have been using my Xbox One for Halo MCC, minecraft and DVDs. I played on the 360 only outta frustration due to MCC multiplayer at the time. A friend and I went back and played halo 3 and halo reach for a few games but realised both games were worse
with a large amount of lag with facing people in other countries. Reach was the worst. There a few games on 360 that I wouldn't mind going back and playing.

I played a multiplayer match in January (matchmaking actually found something, the first time for me since the game launched). Was in the multiplayer game for 10 minutes. Can't remember exactly which playlist it was in Halo MCC. Also in January when I went
to the Halo 2 Campaign Mode, THREE Xbox 1 Dashboard Achievement notifications, popped up in 30 seconds. So it looks like they've been fixing achievements too. MCC is like Halo 1, Halo 2, Halo 3, Halo 4 in ONE game. There's like a bajillion of achievements
in the game too. Halo 2 campaign has amazing 1080p 60fps re-mastered graphics. I saw lots of my friends who have MCC playing just the campaign and they were playing it for a long time. When MCC released, about 8 of my friends from 360 got an Xbox 1 console
and the game. Well Halo is like their flagship game on Xbox. Forza, Zoo Tycoon and Screamride are also Xbox exclusives too.

I am currently playing my way through Halo MCC, Can't wait for halo 6 to release

After playing both, i prefer Halo: MCC