Apex domains cannot have CNAME records.
Question and response
Question
dig unifique.net. NS
Answer
unifique.net. 4 NS dns2.tpa.com.br.
unifique.net. 4 NS dns3.tpa.com.br.
unifique.net. 4 NS dns1.tpa.com.br.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0