Error occured validating the name
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This was worked before the domain upgrade but since then I have been receiving the error "The server with this IP address is not authoritative for the required zone.” this is preventing the zone being replicated to the secondary zone within the trusted domain.
On my Router / Firewall, I had a packet filtering rule that blocked port (phone system). If that last nslookup command you ran was from a workstation, and you're not routing traffic through the DNS server as well, then the problem isn't with the DNS server.