My registrar does not accept your DNS servers
Make sure you are entering the correct DNS servers for your domain. Find your hosting account’s name servers in your Client Area > Websites > Manage > go to the kebab menu > Server Details.
Some local registrars (.de for example) have specific requirements for the DNS servers. Sometimes our server’s default DNSs are rejected because a requirement is not met.
If this is the case, post a ticket from your Client Area in the corresponding Domain Assistance category and explain in detail which requirement is not met. In most cases, we will be able to help you.