Apex domains cannot have CNAME records.
Question and response
Question
dig keenonweb.com. NS
Answer
keenonweb.com. 5 NS ns-1569.awsdns-04.co.uk.
keenonweb.com. 5 NS ns-462.awsdns-57.com.
keenonweb.com. 5 NS ns-656.awsdns-18.net.
keenonweb.com. 5 NS ns-1471.awsdns-55.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0