Apex domains cannot have CNAME records.
Question and response
Question
dig atregabukiea.com. NS
Answer
atregabukiea.com. 4 NS ns-790.awsdns-34.net.
atregabukiea.com. 4 NS ns-1968.awsdns-54.co.uk.
atregabukiea.com. 4 NS ns-1164.awsdns-17.org.
atregabukiea.com. 4 NS ns-797.awsdns-35.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0