You may come across the problem that your name servers were declined for a certain domain, even though the same name servers are already in use with other domain names. There are some registries that require name servers to be configured in a certain way.
If you receive an error message that a domain name could not be registered or transferred because of misconfigured name servers, check if the concerned registry has specific name server requirements.
Usually these registries offer a name server check, which allows checking and verifying the name server compliance before starting an order. The below list links to these registries and their respective name server check:
Please configure your nameservers and zones according to the feedback of their check tool. You should receive a success message in the end. Feel free to contact us if you need further assistance.