Apex domains cannot have CNAME records.
Question and response
Question
dig vanuafoot.com. NS
Answer
vanuafoot.com. 2 NS ns-642.awsdns-16.net.
vanuafoot.com. 2 NS ns-617.awsdns-13.net.
vanuafoot.com. 2 NS ns-596.awsdns-10.net.
vanuafoot.com. 2 NS ns-1280.awsdns-32.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0