Solved it today. If you are on Windows, make sure you have the latest updates fully installed. You do NOT have to take the 1909 feature update. Even if the Windows Update dialog says no updates are available, scan again. And even if it says nothing is available or pending after that, reboot. Go back to Windows Update and check again.
For me, the sequence was:
- check for updates, nothing available
- reboot
- check for updates, ERROR
- reboot
Everything worked after that. Didn't have to play with the internet options, router, firewall, etc.
Good luck.
