Apex domains cannot have CNAME records.
Question and response
Question
dig alt-365.com. NS
Answer
alt-365.com. 5 NS noel.ns.cloudflare.com.
alt-365.com. 5 NS harmony.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0