I have run the update check on our Windows 2016 server and it starts downloading 2021-01 Update for Windows Server 2016 KB4589210 . It stops at 20% downloading and never finishes. I have even waited until the next day. I reboot and it starts the download again and stops at 20%. I have even tried to download the update maually and install it and it fails.
* Windows UpdatesWindows Server 2016Windows OSWindows 10Azure