dns – WHM / Cpanel Why name servers that do not respond to their own records?

I've registered a glue record for new name servers for my domain.com and added them to the nameserver options in Basic WHM Setup and configured address records (see screenshots).

Name server added

Added address record

But if I ping the name server with his record. There is a mistake.
Ping Name Server

what could go wrong?
Note: The name server connection record was registered 24 hours ago. The transfer should therefore not be a problem.