Apex domains cannot have CNAME records.
Question and response
Question
dig tricard.com.br. NS
Answer
tricard.com.br. 5 NS ns-951.awsdns-54.net.
tricard.com.br. 5 NS ns-1806.awsdns-33.co.uk.
tricard.com.br. 5 NS ns-329.awsdns-41.com.
tricard.com.br. 5 NS ns-1079.awsdns-06.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0