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Repeating errors on my domain controllers - "Network Connectivity Assistant" is rejecting some unknown request

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Going through my system logs today I discovered that both my Server 2019 Virtual Domain Controllers seem to have this error firing off every 2 minutes or so:

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The Network Connectivity Assistant service terminated with the following service-specific error: The request is not supported.

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It seems to have started in the middle of the month (16th March), but gives me no more detail than the above to go on. Google doesn't seem to turn up anything revealing. I did not make any config changes on the 16th (last was the installation of the monthly OS patch on the 11th).

I'm not sure how to even begin to track this down - the event itself gives nothing and there does not appear to be another regular event pre-empting it other than that service entering the stopped state. Has anyone any insight into what may be the problem here? These are Hyper-V VMs running Windows Server 2019's usual cast of AD components and basically nothing else.

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I did find that there seems to be a way to query the service to see its triggers. I get this: sc qtriggerinfo NcaSvc [SC] QueryServiceConfig2 SUCCESS SERVICE_NAME: NcaSvc START SERVICE GROUP POLICY : 659fcae6-5bdb-4da9-b1ff-ca2a178d46e0 [MACHINE POLICY PRESENT] START SERVICE DOMAIN JOINED STATUS : 1ce20aba-9851-4421-9430-1ddeb766e809 [DOMAIN JOINED] STOP SERVICE DOMAIN JOINED STATUS : ddaf516e-58c2-4866-9574-c3b615d42ea1 [NOT DOMAIN JOINED] These appear to be some kind of status GUIDs.
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