Apex domains cannot have CNAME records.
Question and response
Question
dig duocircle.com. NS
Answer
duocircle.com. 4 NS ns-937.awsdns-53.net.
duocircle.com. 4 NS ns-1232.awsdns-26.org.
duocircle.com. 4 NS ns-1629.awsdns-11.co.uk.
duocircle.com. 4 NS ns-361.awsdns-45.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0