Apex domains cannot have CNAME records.
Question and response
Question
dig cvsaftedas.com. NS
Answer
cvsaftedas.com. 2 NS ns-1775.awsdns-29.co.uk.
cvsaftedas.com. 2 NS ns-365.awsdns-45.com.
cvsaftedas.com. 2 NS ns-653.awsdns-17.net.
cvsaftedas.com. 2 NS ns-1816.awsdns-35.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0