Apex domains cannot have CNAME records.
Question and response
Question
dig trt22.jus.br. NS
Answer
trt22.jus.br. 5 NS ns-490.awsdns-61.com.
trt22.jus.br. 5 NS ns-1597.awsdns-07.co.uk.
trt22.jus.br. 5 NS ns-1414.awsdns-48.org.
trt22.jus.br. 5 NS ns-756.awsdns-30.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0