Apex domains cannot have CNAME records.
Question and response
Question
dig fbl.vadesecure.com. NS
Answer
fbl.vadesecure.com. 5 NS ns-220.awsdns-27.com.
fbl.vadesecure.com. 5 NS ns-1392.awsdns-46.org.
fbl.vadesecure.com. 5 NS ns-859.awsdns-43.net.
fbl.vadesecure.com. 5 NS ns-1918.awsdns-47.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0