support[.]microsoft[.]com/en-au/help/4464619/windows-10-update-history
Fixed.
“The Windows Update service was impacted by a data corruption issue in an external DNS service provider global outage on January 29, 2019. The issue was resolved on the same day and Windows Update is now operating normally, but a few customers have continued to report issues connecting to the Windows Update service. We expect these issues will go away as downstream DNS servers are updated with the corrected Windows Update DNS entries.”
Briefly, the way the system works is that there is a hierarchy made up of different levels of servers to keep track of URLs, Domain Names, IP Addresses and such. Data, both correct & incorrect, is synced between them, *slowly*.