Apex domains cannot have CNAME records.
Question and response
Question
dig mediamid.com. NS
Answer
mediamid.com. 5 NS ns-211-b.gandi.net.
mediamid.com. 5 NS ns-251-c.gandi.net.
mediamid.com. 5 NS ns-166-a.gandi.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0