Apex domains cannot have CNAME records.
Question and response
Question
dig atualidadesemfoco.com. NS
Answer
atualidadesemfoco.com. 5 NS ns-1189.awsdns-20.org.
atualidadesemfoco.com. 5 NS ns-709.awsdns-24.net.
atualidadesemfoco.com. 5 NS ns-219.awsdns-27.com.
atualidadesemfoco.com. 5 NS ns-2046.awsdns-63.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0