When I managed to play matchmaking games, I got kicked immediately before the very moment a map started loading and recivied a message “Connection was interrupted”. I couldn’t even host a custom game by myself. Same error. I’m pretty sure there are no problems with my network as I was able to play other multiplayer games and my Xboxes were fine when playing MCC. I tried all the 6 titles from Reach to H4. Only CE and H2 Classic multiplayer worked. As for campaign, none of them could be played, ending up with “UE4 fatal error”. It had nothing to do with hardwork requirments because I used to play other titles smoothly. I reinstalled both Steam and Win Store versions and still failed in solving it. I uninstalled the latest quality update before my game was broken, rolling back to 1909. Now my system is up to date (20H2) but the game was still buggy.