I am using Game Pass and have been playing H3 for a while on MCC. I have yet to be able to play Halo Reach due to a message…
Missing Content-
The following content is not installed: Halo Reach Multiplayer. Would you like to customize your installation now?
If you are in a party or currently playing, you will be disconnected and brought back to the main menu if you decide to go further.
(OK) (CANCEL)
I DO HAVE all the content downloaded for MCC. I have uninstalled REACH, and uninstalled MCC entirety and reinstalled. Did not solve. What am I doing wrong?