Error authorising user message on halo 5

Any help much appreciated

over the last month or so I’ve been unable to log into halo 5 and halo the MCC online servers, every time it’s shows up “error authorising user”
ive tried many fixes such as

-soft and hard reset
-deleting and reinstalling my account

  • resetting my router
    -deleting and reinstalling games
    I’ve only noticed it since I’ve subscribed to Xbox game pass ultimate and was wandering if that may have been the issue