MCC MULTIPLAYER BUG???

Hi guys, I really need help. I’m trying to find a solution for my girlfriends multiplayer issue. She cannot connect.
the season passes are all offline.
cannot connect to any multiplayer mode as it says ‘please try again later’
tried uninstalling and reinstalling game.
all her Xbox live settings are ok and all other games work online.
PLEASE HELP! It’s the reason she bought an Xbox!

Try hard resetting the console (press and hold the power button for ten seconds).