Apex domains cannot have CNAME records.
Question and response
Question
dig onsecureax.com. NS
Answer
onsecureax.com. 1 NS ns-1463.awsdns-54.org.
onsecureax.com. 1 NS ns-232.awsdns-29.com.
onsecureax.com. 1 NS ns-650.awsdns-17.net.
onsecureax.com. 1 NS ns-1790.awsdns-31.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0