Apex domains cannot have CNAME records.
Question and response
Question
dig qa23.ecomz.net. NS
Answer
qa23.ecomz.net. 5 NS ns24.digicertdns.net.
qa23.ecomz.net. 5 NS ns20.digicertdns.com.
qa23.ecomz.net. 5 NS ns21.digicertdns.com.
qa23.ecomz.net. 5 NS ns22.digicertdns.com.
qa23.ecomz.net. 5 NS ns23.digicertdns.net.
qa23.ecomz.net. 5 NS ns25.digicertdns.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0