Apex domains cannot have CNAME records.
Question and response
Question
dig xv3gang.com. NS
Answer
xv3gang.com. 4 NS ns-172.awsdns-21.com.
xv3gang.com. 4 NS ns-225.awsdns-28.com.
xv3gang.com. 4 NS ns-1389.awsdns-45.org.
xv3gang.com. 4 NS ns-1559.awsdns-02.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0