Apex domains cannot have CNAME records.
Question and response
Question
dig cleanmycodes.com. NS
Answer
cleanmycodes.com. 5 NS ns-694.awsdns-22.net.
cleanmycodes.com. 5 NS ns-250.awsdns-31.com.
cleanmycodes.com. 5 NS ns-2019.awsdns-60.co.uk.
cleanmycodes.com. 5 NS ns-1120.awsdns-12.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0