@Martin Langhoff No. We definitely do not make any changes there. This looks like the work of an MDM.

thanks for that. There should be no MDM on this system. Very odd; cleared up with a reboot.

Is it possible this is related to Munki?

In my quick reading its possible that Apple just throws this error if there is ever a hiccup contacting the server. I've seen a ton of reports from folks who saw the same behavior when Apple's servers were under load during the Big Sur upgrade release.

interesting.