Apex domains cannot have CNAME records.
Question and response
Question
dig xalvintora.com. NS
Answer
xalvintora.com. 5 NS ns-1356.awsdns-41.org.
xalvintora.com. 5 NS ns-240.awsdns-30.com.
xalvintora.com. 5 NS ns-458.awsdns-57.com.
xalvintora.com. 5 NS ns-1198.awsdns-21.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0