Apex domains cannot have CNAME records.
Question and response
Question
dig negociacaoipanema.com.br. NS
Answer
negociacaoipanema.com.br. 5 NS ns-1169.awsdns-18.org.
negociacaoipanema.com.br. 5 NS ns-221.awsdns-27.com.
negociacaoipanema.com.br. 5 NS ns-542.awsdns-03.net.
negociacaoipanema.com.br. 5 NS ns-1887.awsdns-43.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0