Apex domains cannot have CNAME records.
Question and response
Question
dig kame-training.com. NS
Answer
kame-training.com. 1 NS ns-874.awsdns-45.net.
kame-training.com. 1 NS ns-18.awsdns-02.com.
kame-training.com. 1 NS ns-237.awsdns-29.com.
kame-training.com. 1 NS ns-399.awsdns-49.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0