Have you tried this?
UNINSTALL AND REINSTALL GAMING SERVICES VIA POWERSHELL
Delete the Gaming Services registry keys and reinstall the Gaming Services app via Powershell.
In the Windows search bar, type Windows PowerShell
In the menu, select “Run as administrator”
In the Administrator: Windows PowerShell screen, type the following command and press Enter:
get-appxpackage Microsoft.GamingServices | remove-AppxPackage -allusers
In the same window, type the following command and press Enter:
start ms-windows-store://pdp/?productid=9MWPM2CQNLHN
Click Install** to install Gaming Services (select Yes if you receive the User Account Control (UAC) prompt)
Restart your device.
**The install button is expected to disappear once you have successfully updated to the correct version.