Windows 2012 DHCP Failover "Lost contact with partner"

We have stood up a pair of Windows 2012 DHCP servers and configured DHCP failover (in Load Balancing mode) as per the Microsoft Technet article.  The two servers are on the same subnet, and time is in sync between them.  Almost immediately after
configuring scopes to failover, one node loses contact with the other, and the alternate node goes to failover mode "Recover".
We have restarted both servers and services.  Both DHCP servers show as available.  Clicking "Replicate Failover Scopes" completes successfully with no errors, and the only two warnings in the Event Log are about credentials for Dynamic
DNS updates and a dynamic IPv6 address (which we don't use at all.)
How come they can replicate, but have "lost contact"; and how do we get the one out of "Recover" mode?

You should see Recover state only if one of the DHCP server actually went down and came back up. In this case the server which comes back up would be in Recover state but will transition to Recover_Wait state and come back to Normal after it syncs it
leases. This should be relatively quickly. Did your servers continue to remain in the Lost Contact...\Recover state for long.
Did you see any events in the DHCP Server admin channel
Microsoft\Windows\DHCP Server\Admin.
You can also enable AuditLogs (Microsoft\Windows\DHCP
Server\AuditLogs) which logs all the server to server messages. You can enable the log by right clicking on
Microsoft\Windows\DHCP Server. View->Show Analytical and Debug Logs. This will show the
Microsoft\Windows\DHCP Server\AuditLogs in event viewer. You can then right click and enable the log and see if there are any failures
being logged there.

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