GTM nameserver records not reponding

Hi Jason, yes both nameservers are part of the HA pair, we don't have other nameservers involved. I do only have one SOA record configured on the GTM and two NS records, I don't know if it is required to have one SOA records for each nameserver speaking in terms of DNS. However connecting to either both of the nameservers, the GTM resolves correctly. Just find it very weird that it doesn't display all nameservers when asking specifically for them using nslookup or dig and also that the domain check is failing.