How to fix "One or more members of your party do not have the entitlement to play this game"

First off, apologies if this isnt the correct sub, not sure if it should be here or in the XboxSupport.

I bought the Halo:Master Chief Collection a long time ago and decided to give it a try for the first time on PC (never played Halo before), it was going fine yesterday and the previous days (got to mission 5 in CE), but now everytime I try to resume the mission it just says

"one or more members of your party do not have the entitlement to play this game"

...Why? First of there is no party, its only me playing and It was clearly fine the previous days, now I cant even play the game I clearly bought.

I start the game from the MicrosoftStore and it clearly says that all games are instaled, plus I just uninstalled the game a few minutes ago and its still the same, I still cant play it.