Can't register nameservers with registry

I have several domains bought through the same registrar. They are all set to our own nameservers hosted on our own dedicated server. We are now moving our dedicated server to another company, so we have set up new nameservers on that server and are going to migrate domains over one by one.

BUT, when I try to change the nameservers on any of our .com domains via the registrar's control panel, we receive the error "Nameserver doesn't exist in the registry". Their help pages state that you need to contact their support to "request the name server be registered for all registrars". Other posts on here seem to agree with this e.g.

I have been emailing and phoning the registrar all week but cannot get them to reply to any email or pick up the phone! I can't seem to proceed with moving domains over until these nameservers are registered. Is there any other way I can do it without going via our registrar?
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Computer101Connect With a Mentor Commented:
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Have you contacted the new registrar for help in registering  If you are trying to move to the new registry and also use - that might be the best.  but has the new registry been able to offer you any help in the matter

groovyjonAuthor Commented:
I'm not moving registrars, just the company that manages the server. The domains are already registered through another registrar company - it is them that we are unable to get through to.

In the end, I found a way to solve the problem. I registered an entirely new (random) domain name with another registrar and set the nameservers to be our new ones. It seems that their system automatically updates all registries with the nameserver info as soon as you use them. After I'd done that, I was able to specify those nameservers with the existing registrar without any complaints.
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