Internet down — something odd has happened to Xbox MSFS

User Support Hub Hardware & Peripherals
10

It’s a real drag you chose to uninstall the sim, as I am certain your issue was it being set to Offline, which you could have solved by changing a setting.

Now you’re stuck in this mess and there isn’t a known solution yet:

https://forums.flightsimulator.com/t/all-wus-and-marketplace-purchases-uninstall-themselves-continuously/582798