Apex domains cannot have CNAME records.
Question and response
Question
dig yourkeytobluffton.com. NS
Answer
yourkeytobluffton.com. 4 NS ns-347.awsdns-43.com.
yourkeytobluffton.com. 4 NS ns-1436.awsdns-51.org.
yourkeytobluffton.com. 4 NS ns-1469.awsdns-55.org.
yourkeytobluffton.com. 4 NS ns-1723.awsdns-23.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0