PC Game Pass still does not work locally on Linux, but Xodus has completed several parts of the download and licensing process and is now tackling Xbox game services.
Xodus is an open-source reverse-engineering effort to make Xbox PC games (including GamePass) run on Linux and Mac systems. We handle everything needed to get GDK-based Xbox titles running outside of Windows.
This project is not affiliated nor endorsed by Microsoft. Use at your own risk.
Based on https://github.com/xodus-gaming