Can't update my registrar DNS

I also wrote to my registrar support (register.it) and they said to test the nameserver list on https://dns-check.nic.it to understand what’s the problem because it seems that the authority refuses my DNS and then they said to contact the provider of these DNS.
Here’s the xml result from the DNS validation, you can import it to https://dns-check.nic.it:
DNS CONFIGURATION VALIDATION - Pastebin.com

@ivan_ak7 said:
I also wrote to my registrar support (register.it) and they said to test the nameserver list on https://dns-check.nic.it to understand what’s the problem because it seems that the authority refuses my DNS and then they said to contact the provider of these DNS.
Here’s the xml result from the DNS validation, you can import it to https://dns-check.nic.it:
DNS CONFIGURATION VALIDATION - Pastebin.com

Hi,
It looks like this KB article is your answer:
https://infinityfree.net/support/unable-to-set-nameservers-dns-query-refused/