When trying to setup new name servers in GoDaddy’s domain manager, I received an error message “Nameserver not registered”.
For GoDaddy to recognize new name  servers they may have to be registered via the following steps:
- Access the GoDaddy Domain Manager
- Click on the domain you’d like to add the name servers for
- In the lower left hand corner, look for the ‘Host Summary’ section
- Add the new host e.g. ns1 and set it to point to the appropriate IP address.