Apex domains cannot have CNAME records.
Question and response
Question
dig williamriggles.com. NS
Answer
williamriggles.com. 3 NS ns-1880.awsdns-43.co.uk.
williamriggles.com. 3 NS ns-815.awsdns-37.net.
williamriggles.com. 3 NS ns-1068.awsdns-05.org.
williamriggles.com. 3 NS ns-1588.awsdns-06.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0