Apex domains cannot have CNAME records.
Question and response
Question
dig greatcccam.com. NS
Answer
greatcccam.com. 5 NS ns-1404.awsdns-47.org.
greatcccam.com. 5 NS ns-1552.awsdns-02.co.uk.
greatcccam.com. 5 NS ns-739.awsdns-28.net.
greatcccam.com. 5 NS ns-1186.awsdns-20.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0