Apex domains cannot have CNAME records.
Question and response
Question
dig tm2app.com. NS
Answer
tm2app.com. 2 NS simone.ns.cloudflare.com.
tm2app.com. 2 NS aaden.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0