Apex domains cannot have CNAME records.
Question and response
Question
dig harrismccarter.com. NS
Answer
harrismccarter.com. 5 NS ns-1824.awsdns-36.co.uk.
harrismccarter.com. 5 NS ns-1965.awsdns-53.co.uk.
harrismccarter.com. 5 NS ns-191.awsdns-23.com.
harrismccarter.com. 5 NS ns-303.awsdns-37.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0