Apex domains cannot have CNAME records.
Question and response
Question
dig virtualinteractions.com.br. NS
Answer
virtualinteractions.com.br. 2 NS ns-347.awsdns-43.com.
virtualinteractions.com.br. 2 NS ns-1778.awsdns-30.co.uk.
virtualinteractions.com.br. 2 NS ns-1091.awsdns-08.org.
virtualinteractions.com.br. 2 NS ns-990.awsdns-59.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0