MDM is unable to reach APNs

MDM is unable to reach APNs

We've been seeing this error on the Enrollment tab for most of the day:

MDM is unable to reach APNs
"api.push.apple.com" must be opened on the outgoing port 443 of your proxy server/firewall to manage iOS devices
 Check Connection Now
I am not aware of what the implications may be at this point. We have an on-prem server. Our network logs reveal no releated communication problems. Anyone else encountering this error and/or have any suggestions?


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