Apex domains cannot have CNAME records.
Question and response
Question
dig ybnpain.com. NS
Answer
ybnpain.com. 5 NS ns-1927.awsdns-48.co.uk.
ybnpain.com. 5 NS ns-290.awsdns-36.com.
ybnpain.com. 5 NS ns-820.awsdns-38.net.
ybnpain.com. 5 NS ns-1022.awsdns-63.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0