Apex domains cannot have CNAME records.
Question and response
Question
dig superempresarialtribanco.com.br. NS
Answer
superempresarialtribanco.com.br. 5 NS ns-213.awsdns-26.com.
superempresarialtribanco.com.br. 5 NS ns-1830.awsdns-36.co.uk.
superempresarialtribanco.com.br. 5 NS ns-1529.awsdns-63.org.
superempresarialtribanco.com.br. 5 NS ns-641.awsdns-16.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0