Apex domains cannot have CNAME records.
Question and response
Question
dig supernovaee.com. NS
Answer
supernovaee.com. 2 NS ns-321.awsdns-40.com.
supernovaee.com. 2 NS ns-1944.awsdns-51.co.uk.
supernovaee.com. 2 NS ns-311.awsdns-38.com.
supernovaee.com. 2 NS ns-773.awsdns-32.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0