I actually had first real problem with windows game store last night trying to give Crusader Kings a try and it somehow broke my Xbox app and store...wouldn't let me run anything as admin or download anything. the solutions to this I found online were pretty lol (
I had to reinstall windows! ) so if anyone ever runs into issue:
Start > Run
shell:AppsFolder to get to the dumb hidden app folder
pin Xbox to taskbar
hold shift+ctrl and click to run in admin mode
hit install on gamepass page, but before running first time right click on icon and create desktop shortcut.
right click that to run as admin and should at least bring up the launcher, which worked for me at that point no issues.