SNMP engine Id matches with the existing engine Id

SNMP engine Id matches with the existing engine Id

We recently moved all of our systems from a 172.xxx.xxx.xxx subnet to a 10.xxx.xxx.xxx subnet. After the IP address change I attempted to add our firewall back into monitoring but when I add the firewall I receive an error "The host (10.xxx.xxx.xxx) is added as a non-SNMP device, since its engine Id matches with the existing engine Id of 172.xxx.xxx.xxx" I cannot change the firewall SNMP engineID, how do I remove the existing engine ID of 172.xxx.xxx.xxx

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