I seem to have got it working again for me at least.
Completely uninstalled MSFS, reset the ms store, reset the gaming services - this by itself did not work as now it refused to install MSFS again.
So did the following from Xbox troubleshooting ;
- Right-click the Start button in the lower-left corner of the main screen, and then select Windows PowerShell (Admin).
- In the Administrator: Windows PowerShell screen, type the following command and press Enter:
3.get-appxpackage Microsoft.GamingServices | remove-AppxPackage -allusers*
- In the same window, type the following command and press Enter:
5.start ms-windows-store://pdp/?productid=9MWPM2CQNLHN*
- Install the app on that page, and select Yes when you receive the User Account Control (UAC) prompt.
- Restart your device, and try to install the game again.
Then was the long wait for the download, I’m glad I have unlimited fibre internet and went to bed while it reinstalled. I have the game open right now and I am reinstalling all the extra content packages.