Didn't Unlock the Halo 2 armor through MCC. Help!

Hey guys,

So about an hour ago I completed the “Cairo Station” mission and received the achievement for doing so. I still have yet to unlock the armor that comes with the achievement. What should I do? I know this has been a popular issue over the past couple years.

I checked Waypoint, I turned my Xbox ONE off (hoping that works when I return home later). I am out of options and patience, why is this still an issue 2 years later??

What probably needs to happen is your MCC game needs to sync up with Halo Channel. Go back to MCC, change a customization item, maybe play a multiplayer match or something. Make sure the game saves your settings. It may help to also open the Halo Channel app. After all that, go back to Halo 5 and see if the armor is there.