Modify the Name Server (NS) record. A NS record would be created automatically and you cannot modify it (but you can add to it to support co-hosting domains). You can add additional name servers to this NS record set, to support co-hosting domains with more than one DNS provider. You can also modify the TTL and metadata for this record set. However, you cannot remove or modify the pre-populated Azure DNS name servers. Reference: https://docs.microsoft.com/en-us/azure/dns/dns-delegate-domain-azure-dns