Apex domains cannot have CNAME records.
Question and response
Question
dig flamingdot.com. NS
Answer
flamingdot.com. 2 NS ns-2032.awsdns-62.co.uk.
flamingdot.com. 2 NS ns-1251.awsdns-28.org.
flamingdot.com. 2 NS ns-388.awsdns-48.com.
flamingdot.com. 2 NS ns-952.awsdns-55.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0