Apex domains cannot have CNAME records.
Question and response
Question
dig xonverita.com. NS
Answer
xonverita.com. 1 NS ns-1057.awsdns-04.org.
xonverita.com. 1 NS ns-1855.awsdns-39.co.uk.
xonverita.com. 1 NS ns-1941.awsdns-50.co.uk.
xonverita.com. 1 NS ns-343.awsdns-42.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0