Apex domains cannot have CNAME records.
Question and response
Question
dig lnxserversecure.com. NS
Answer
lnxserversecure.com. 1 NS jerome.ns.cloudflare.com.
lnxserversecure.com. 1 NS pam.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0