Hi. I got the same issues with the game with Microsoft Store Error Code during FFS2020 download.
This is what i try and it not working:
Disable Firewall (not working)
Reboot PC (not working)
Update All programs in Microsoft Store. (not working)
This is how i resolve the situation:
Remove the game
Search on google for : Windows update assistant to Update windows 10 to May 2020 version,
Reboot
Disable Bitdefender (anti-virus)
Start the installation from Microsoft Store.
Thanks to all.
Dave