Apex domains cannot have CNAME records.
Question and response
Question
dig ns1.staybox.com.br. NS
Answer
ns1.staybox.com.br. 5 NS cpanel.tcheturbo.com.br.
ns1.staybox.com.br. 5 NS hosting.tcheturbo.com.br.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0