Apex domains cannot have CNAME records.
Question and response
Question
dig cob.localiza.com. NS
Answer
cob.localiza.com. 5 NS ns-1360.awsdns-42.org.
cob.localiza.com. 5 NS ns-1547.awsdns-01.co.uk.
cob.localiza.com. 5 NS ns-431.awsdns-53.com.
cob.localiza.com. 5 NS ns-819.awsdns-38.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0