Apex domains cannot have CNAME records.
Question and response
Question
dig socarrao.com.br. NS
Answer
socarrao.com.br. 5 NS ns-1311.awsdns-35.org.
socarrao.com.br. 5 NS ns-1686.awsdns-18.co.uk.
socarrao.com.br. 5 NS ns-391.awsdns-48.com.
socarrao.com.br. 5 NS ns-539.awsdns-03.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0