I downloaded MicFlightSim using the xbox game pass and it is trying to do a fresh install...

did you upgrade or did you do a fresh install, if a fresh install then as the windows games are placed in an encrypted folder this breaks as it is tied to the one install of windows, you would need to re download the games if that is the case.

if upgraded then they should still work ok and are located under the xbox app in the library.

as i said i wanted to do a fresh install, yes i pass tpm and secure boot

Try installing it from the Xbox (beta) app. If you haven't downloaded it, you can do so at https://www.xbox.com/xbox-game-pass/pc-games?xr=shellnav

*Do a Hard reset? (Hold the white power button on the front of your xbox, even when the light goes out...keep holding it till you hear slight whine and when you hear nothing then let go.)

Have you tried a fresh re-install? If you do a fresh re-install of Overwatch, I wouldn't play the game until it has finished downloading. Also maybe try saving it on a different hard drive this time?

I had tried everything too, everything!, without success, I finally did a fresh installation of Windows 10 and the problem was solved, now I can download any game of the Xbox Game Pass without any problem. It is not the most elegant solution, but since
I did not see a solution from Microsoft, I decided to do it and now everything works correctly.