Apex domains cannot have CNAME records.
Question and response
Question
dig mmtv1v.com. NS
Answer
mmtv1v.com. 4 NS ns-1791.awsdns-31.co.uk.
mmtv1v.com. 4 NS ns-1661.awsdns-15.co.uk.
mmtv1v.com. 4 NS ns-1327.awsdns-37.org.
mmtv1v.com. 4 NS ns-1501.awsdns-59.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0