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Event 20291 DHCP-Server

Last Modified: 2017-03-25
Server 1 Windows Server 2016 - DC, DNS, DHCP
Server -2 Windows Server 2012 - DC, DNS, DHCP

Between two DHCP servers I have configured Load balanced (50/50) failover.
Time to time I get this Event:

A BINDING-ACK message with transaction id: 61 was sent for IP address: with reject reason: (Reject Reason Unknown) to partner server: Server2.domain.local for failover relationship: Server 2  to Server1.

I looked in the DHCP and I dont see that IP address leased to someone.
Please let me know if you had this experience
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Technical Lead - Active Directory
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