Update: This issue should be resolved.
For users running into issues installing Xbox Game Pass games on their Shadow and getting the error message “For this game, choose a drive that's formatted as NTFS” OR error code 0x80073D13, we now have a lovely article on how to resolve this issue!
If the issue still persists after trying the above solution, you can try using this community workaround on Reddit!
Disclaimer: This is a community workaround (not official). Please advance at your own risk. Our team is both aware of and looking into the issue.