Apex domains cannot have CNAME records.
Question and response
Question
dig korngaroo.com. NS
Answer
korngaroo.com. 5 NS ns-1885.awsdns-43.co.uk.
korngaroo.com. 5 NS ns-664.awsdns-19.net.
korngaroo.com. 5 NS ns-1072.awsdns-06.org.
korngaroo.com. 5 NS ns-1631.awsdns-11.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0