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