Apex domains cannot have CNAME records.
Question and response
Question
dig tudoall.com.br. NS
Answer
tudoall.com.br. 5 NS ns1.tudoall.com.br.
tudoall.com.br. 5 NS ns2.tudoall.com.br.
Authority
The response has no authority records.
Additional
ns1.tudoall.com.br. 5 A 162.240.145.136
ns2.tudoall.com.br. 5 A 162.240.98.252
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0