Symptom
UltraDNS name server error: "Unknown name server configured"
Root Cause
Domain has NS Records for the apex pointing to unknown name servers that were not assigned by UltraDNS
Steps to Resolution
Delete NS Records for unknown name servers - How to delete name server records
Additional Information
This issue often occurs when creating a domain by uploading a zone file with NS Records pointing to previous DNS provider's name servers. It is a good idea to delete these NS Records prior to uploading the zone file in the UI. The UI will automatically create NS Records pointing to UltraDNS name servers assigned to your account.
It may take up to seven (7) days for the warning to clear after deleting the offending NS Records so please ignore warnings if NS Records to unknown name servers are intentional.