Apex domains cannot have CNAME records.
Question and response
Question
dig webbytelecom.com.br. NS
Answer
webbytelecom.com.br. 5 NS balerion.alares.network.
webbytelecom.com.br. 5 NS dracarys.alares.network.
webbytelecom.com.br. 5 NS scadufax.alares.network.
webbytelecom.com.br. 5 NS gandalf.alares.network.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0