Apex domains cannot have CNAME records.
Question and response
Question
dig speakeasywithjohnandmatt.com. NS
Answer
speakeasywithjohnandmatt.com. 4 NS ns-282.awsdns-35.com.
speakeasywithjohnandmatt.com. 4 NS ns-1801.awsdns-33.co.uk.
speakeasywithjohnandmatt.com. 4 NS ns-1469.awsdns-55.org.
speakeasywithjohnandmatt.com. 4 NS ns-515.awsdns-00.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0