Apex domains cannot have CNAME records.
Question and response
Question
dig flpkanagawa.com. NS
Answer
flpkanagawa.com. 5 NS ns-1553.awsdns-02.co.uk.
flpkanagawa.com. 5 NS ns-393.awsdns-49.com.
flpkanagawa.com. 5 NS ns-1396.awsdns-46.org.
flpkanagawa.com. 5 NS ns-1467.awsdns-55.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0