Apex domains cannot have CNAME records.
Question and response
Question
dig mymagicmustache.com. NS
Answer
mymagicmustache.com. 5 NS ns-1817.awsdns-35.co.uk.
mymagicmustache.com. 5 NS ns-142.awsdns-17.com.
mymagicmustache.com. 5 NS ns-353.awsdns-44.com.
mymagicmustache.com. 5 NS ns-683.awsdns-21.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0