Apex domains cannot have CNAME records.
Question and response
Question
dig armazemdatacenter.com. NS
Answer
armazemdatacenter.com. 5 NS ns1.armazemdatacenter.com.br.
armazemdatacenter.com. 5 NS ns3.armazemdatacenter.com.br.
armazemdatacenter.com. 5 NS ns2.armazemdatacenter.com.br.
armazemdatacenter.com. 5 NS ns4.armazemdatacenter.com.br.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0