If you think you may be suffering from any connection issues with the game, including problems downloading updates, seeing in game servers, having problems with multi-player, then resetting your xbox network connection may help.
To do this:
a) Open your start menu, and open the Windows 10 settings app
b) Click on the Gaming menu option
c) On the left menu click on Xbox Networking
d) If you see any error (may include the words ‘This could block you from playing multiplayer’) click the Fix It button
e) Click Check Again
f) If the problem persists repeat steps d and & e , you may have to do this a few times
g) Once the errors are gone, run Flight Sim again and see if the errors are gone.