Apex domains cannot have CNAME records.
Question and response
Question
dig bellmedia.io. NS
Answer
bellmedia.io. 5 NS apollo.ns.cloudflare.com.
bellmedia.io. 5 NS miki.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0