Solo campaign not saving - game pass version

Hi all! I just got halo 5 through Game Pass and had a string of bad experiences with the game saves:

  • First I was constantly kicked out form the game to the maim menu… I had to restart the first mission 3/4 times.
  • Then I managed to get to the third mission and saved the game, but when restarting the game the load file wasn’t working, yet I had the chance to play form the third mission onwards
  • Today I played thee hours and progressed to mission seven and the game didn’t save any progress… I can’t replay the past missions nor start from the last point I was.
    Also I noticed I didn’t get any achievement!

The Xbox is online, but the game seems not to.

How can I solve this ? It’s soo frustrating.

I tried to do a search on the forum, but if I see a few post with a similar problems they all don’t end up with@ solution

I hope Someone can help here !
Thank!