Apex domains cannot have CNAME records.
Question and response
Question
dig anyvm.tech. NS
Answer
anyvm.tech. 4 NS annalise.ns.cloudflare.com.
anyvm.tech. 4 NS rick.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0