Update: Try just closing the process and opening it again! it seems to help. #LaunchDayIssues?
Just a quick one to hopefully help anyone that’s installed the new Microsoft Flight Simulator 2020 from the Microsoft Store. Potentially getting stuck with a progress bar after setting their accessibility preferences (the first thing the game asks you to do).
This happened for me on launch day on version 126.96.36.199 but the fix may work for other versions too.
Try setting your graphics card preference for the UWP app, this seems to help the launcher not get stuck during the content check.
To set your Graphics Card Preference
In Windows 10, goto Settings > Display > Graphics Settings
Under Graphics Performance settings, select Microsoft Store app and Microsoft Flight Simulator in the drop downs and click Add
Now click on Options and select your high performance GPU
Now, Wait for the Download
Click Save, close all the windows, start Flight Simulator again and get cozy for a ~91GB download.
Hope this helps.