Apex domains cannot have CNAME records.
Question and response
Question
dig brphonia.com.br. NS
Answer
brphonia.com.br. 5 NS ns2.brphonia.com.br.
brphonia.com.br. 5 NS ns1.brphonia.com.br.
Authority
The response has no authority records.
Additional
ns1.brphonia.com.br. 5 A 177.74.144.3
ns2.brphonia.com.br. 5 A 177.74.144.164
ns1.brphonia.com.br. 5 AAAA 2804:10c8:0:7:177:74:144:3
ns2.brphonia.com.br. 5 AAAA 2804:10c8:0:faca:177:74:144:164
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0