Apex domains cannot have CNAME records.
Question and response
Question
dig matthewmengel.com. NS
Answer
matthewmengel.com. 5 NS ns-2025.awsdns-61.co.uk.
matthewmengel.com. 5 NS ns-356.awsdns-44.com.
matthewmengel.com. 5 NS ns-105.awsdns-13.com.
matthewmengel.com. 5 NS ns-1712.awsdns-22.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0