Tenacious "Some settings are managed by your organization" messages

This is not a clone of the '"Some settings are managed by your organization" while not on a domain' question, though they are similar.

I have several settings where the message occurs, notably Windows Update->Advanced Settings, Privacy->Feedback & Diagnostics, and Cortana. These prevent me from following the steps of the given solution to the similar question.

I have looked at the Group Policy Editor as an administrator, but no settings are configured for either the computer or the user. I have checked HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows and noted that A. Cortana is disabled B. There is no WindowsUpdate Key

I have some recollection of using the Group Policy Editor to modify these settings to their current state, but since they no longer seem to be in effect, I don't seem to have any way of changing them back.

What's happened? Is something corrupted, or am I missing something?

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