Hi Ken,
Try Reset Windows Update Client settings script to reset Windows Update components again.
https://learn.microsoft.com/en-us/windows/deployment/update/windows-update-resources#how-do-i-reset-windows-update-components
Next, install the latest SSU KB5000859 (March 9, 2021)
https://support.microsoft.com/en-us/topic/kb5000859-servicing-stack-update-for-windows-10-version-1809-march-9-2021-131d7ec3-a212-4d10-9679-e97395197bac
Restart computer.
Manually install the latest CU March 15, 2021—KB5001568
https://www.catalog.update.microsoft.com/Search.aspx?q=KB5001568
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