I do have same issue. I did fresh installation on steam, buy and download microsoft flight simulator. It download succesfully and entering the game until microsoft account login. After entering credential, the screen was blurred and the game going force close suddenly. Try re-launch the game even with admin level. This game doesn’t even download additional package yet.
I search on forum/youtube and done some fix such as re-login xbox/microsoft/steam account, increase virtual memory, updating to latest vga driver/windows/xbox app, no overclocking, disable windows defender/firewall (no additional antivir installed).
All that try doesn’t fix my issue, game still force close few moment after entering the game. Anybody has another solution?