Apex domains cannot have CNAME records.
Question and response
Question
dig rivetonheadphones.com. NS
Answer
rivetonheadphones.com. 5 NS ns-126.awsdns-15.com.
rivetonheadphones.com. 5 NS ns-1526.awsdns-62.org.
rivetonheadphones.com. 5 NS ns-1014.awsdns-62.net.
rivetonheadphones.com. 5 NS ns-1603.awsdns-08.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0