Apex domains cannot have CNAME records.
Question and response
Question
dig nivexor.com. NS
Answer
nivexor.com. 5 NS ns-1605.awsdns-08.co.uk.
nivexor.com. 5 NS ns-1419.awsdns-49.org.
nivexor.com. 5 NS ns-987.awsdns-59.net.
nivexor.com. 5 NS ns-1416.awsdns-49.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0