It is hard to guess what the problem with this particular domain name is. I could give any details if you at least provided the domain itself.
If you use external name servers (i.e. default registrar) rather than server default or private ones, I would suggest updating them to ours. Thus you would use DNS zone on the server which should be free of any error.
Anyway, the technicians should investigate it for you. Please submit a technical department ticket at
https://whbsupport.com