Halo Master Chief Saga bugged

I’ve done the master chief saga Playlist 3 total times now and everytime it doesn’t give me the achievement I get upset and take a long break and I honestly don’t know what it wants. I’ve viewed all the reddit and forum posts about it and like is there somewhere I can submit a ticket to get this fixed or rewarded to me? No matter what I do it always says 43/46 missions.

On another note the viewing halo 2 missions one seems to be stuck as well.

Are you doing the playlist co-op and/or playing offline? I know this may seem like a generic question at this point, but knowing the answer to this usually does help in finding a solution.