Maybe try this:
Go to Services -> UnboundDNS -> Advanced
Then in "Rebind protection networks" remove 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16
And then hit Apply button
Sorry it wont work, I missed that it's about Registering static Mappings
Go to Services -> UnboundDNS -> Advanced
Then in "Rebind protection networks" remove 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16
And then hit Apply button
Sorry it wont work, I missed that it's about Registering static Mappings