Having the same issue. I raised the authentication level to Packet Integrity on a Server 2016 DC, rebooted and errors still present. Checked my MX device and had a generic WMI error that referenced setting up MX device to authenticate to AD. Configuring Active Directory with MX Security Appliances - Cisco Meraki Read the link a bit and went back to the device and error is no longer present. Looking into it further tomorrow. Will update if any progress.
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