Please somebody help me? Dns timed out - no autority in registro.br

I have a domain xxx.com.br and i have this domain configured in cpanel with ns1, ns2, ns3 and ns4 pointing 4 different ips, however I installed cwp on another server and pointed through A entries in my domain configured in cpanel to ns5 and ns6, I also pointed out the hostname, works correctly the ns5, including with domain authority, however the ns6 does not work, every time I try to configure in registro.br my ns6 as secondary dns in a newly registered domain it shows that the has no domain authority, but the ns6 does not work, every time I try to configure in registro.br my ns6 as secondary dns in a newly registered domain it shows that the has no domain authority.

ns5 ok:



ns6 error:




I checked all the settings, including some tutorials and could not solve the problem.

tutorial:

https://www.awsmonster.com/2019/01/cwp-dns-part-1-how-to-configure-dns.html

https://www.awsmonster.com/2019/01/cwp-dns-part-2-how-to-configure-dns.html