You may want to add a post in topic: "Steam version CTD after blackshark.ai logo and legal notices" found in Bugs & Issues > Performance & Graphics. I haven't seen any fixes posted there yet, but it looks like someone else is having an issue similar to yours with their Steam version.
Since your game is crashing even before you're flying, I'd try this, if you haven't yet:
- Uninstall the game
- Press the Windows Key
- Type in: wsreset in the "Type here to search" box
- Right-click and select Run as Administrator
- Once complete, reboot computer
- Reinstall the game from Steam
- Go to Settings > Apps
- Find Microsoft Flight Simulator on the list
- Select Advanced Options
- Select Reset
When you open the game after the reset, it will download the entire game (100GB plus), which takes a while.
My Microsoft Store version is nearly bullet-proof these days and I haven't crashed in over a month now.
Best of luck,
Bill