Apex domains cannot have CNAME records.
Question and response
Question
dig xendavrix.com. NS
Answer
xendavrix.com. 5 NS ns-525.awsdns-01.net.
xendavrix.com. 5 NS ns-810.awsdns-37.net.
xendavrix.com. 5 NS ns-557.awsdns-05.net.
xendavrix.com. 5 NS ns-1467.awsdns-55.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0