Apex domains cannot have CNAME records.
Question and response
Question
dig interede.com.br. NS
Answer
interede.com.br. 5 NS elliott.ns.cloudflare.com.
interede.com.br. 5 NS piper.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0