Microsoft has posted some troubleshooting steps for bad loads
https://flightsimulator.zendesk.com/hc/en-us
Good Luck
I had the same but when i checked for windows updates i noticed an update that was non essential so i thought what the hell. It seemed to deal with connection with the microsoft store. Anyway mine works now.
With the release of 1.19.8.0 my issue is finally resolved and the sim is now playable for the first time since June 17.