My xbox game pass games are all stuck on syncing data when I try to launch them

Open task manager, go to "details" section and there find "gamingserives.exe" process. End this task, then it should restart after a few seconds. After that open your game.

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Restart your Xbox console: Restarting your console can sometimes resolve issues with stuck games or other issues. To do this, press the Xbox button on your controller to bring up the guide, then select "Restart console."

Check for system updates: Make sure that your Xbox console is up to date with the latest system updates. To check for updates, go to the "System" tab in the Xbox guide, then select "Settings," followed by "System," and finally "Updates."

Clear the cache on your console: Clearing the cache on your console can help resolve issues with stuck games or other issues. To do this, press the Xbox button on your controller to bring up the guide, then select "System," followed by "Settings," and finally "System." From there, select "Storage" and then select your primary storage device. Finally, select "Clear local saved games."

Check your internet connection: A stable internet connection is required to play games on Xbox Game Pass. Make sure that your internet connection is working properly and that your router is functioning correctly. You can also try resetting your router to see if that resolves the issue.

Uninstall and reinstall the game: If the steps above don't resolve the issue, you may need to uninstall and reinstall the game. To do this, go to the "My games & apps" tab in the Xbox guide, select the game, and then select "Manage game." From there, select "Uninstall all" and then follow the prompts to uninstall the game. Once the game is uninstalled, you can reinstall it from the Xbox Game Pass library.

The problem persists after doing all of these things, although i am on pc, so console solutions won't help me

Unfortunately not, did all the steps restarted and atttempted to launch the game to the same 3 errors in event viewer and game still stuck at syncing data and the xbox app as crashed.

Yes , the game data is saved on the cloud and the season pass you purchase is linked to your account. When you log in to the new xbox box and launch fallout it will sync the save data.