I’ve added ns1, ns2, and ns3 to the nameserver list on the domain registrar’s side. For reference, this is nic.switch.ch.
Here is the output given by the registrar:
The exact error is “Test: [TEST SOA record present]: server failure (IN/SOA: framba.ch.)
Status This domain name does not work for us.
Test results in detail
Test: No illegal symbols found in domain name
Test: All addresses are distinct
Test: Delegation response fit in a 512 byte UDP packet
Test: Server replies to TCP DNS request on port 53
Test: No illegal use of dash (’-’) in the domain name found
Test: At least one nameserver found
Test: Server replies to UDP DNS request on port 53
Test: Delegation response with additional fit in a 512 byte UDP packet
Test: At least two nameservers found
Test: Address is not part of a private subnet