I have problem setting up a server

I setted up a server....
then I went to domain registrar and create another DNS 3 days ago...

ns3.domainB.com > new server
ns4.domainB.com > new server
ns1.domainB.com > old server
ns2.domainB.com > old server


in the new server, i have created an account for domainA.com
i changed domainA.com DNS to ns3.domainB.com and ns4.domainB.com


But then it seems to be not working, it gives me cannot find server.

the domainB.com is located in old server

am i missing a step? or the hostname dns should be added on the old server?

Thanks

 

 

 

 

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