Since you removed the useful information from your post, like the name of the site, we can't tell you what's wrong. We can only guess and tell you what some common errors are. The most common error is that you have to list the name servers TWICE, in two different places in the registrar. You probably already know where to list the DNS servers that are authoritative for a.domain. What most most people don't know until they've done it is that first you have to create those servers elsewhere in the registrar, with IP addresses. Otherwise you have a chicken.and egg problem - you have to talk to ns1.domain.com to get the IP for any name within domain.com, but ns1.domain.com is part of domain.com, so you need to have the IP of ns1.domain.com to get the IP of ns1.domain.com.
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