https://wccftech.com/microsoft-says-windows-update-dns-issue-has-been-fully-mitigated/

Earlier this month, several Windows 10 users reported issues with downloading updates from Windows Update. Microsoft had confirmed that the issue was caused by an external DNS service provider’s global outage, which was fixed after a day of disruption. However, multiple user reports indicated that the problem persisted.

In a fresh update, Microsoft has today clarified that the issues have finally been resolved for all users and the problem has been “fully mitigated because the majority of local Internet Service Providers (ISP) have refreshed their DNS servers.”