Apex domains cannot have CNAME records.
Question and response
Question
dig 720boardshop.com. NS
Answer
720boardshop.com. 4 NS ns-970.awsdns-57.net.
720boardshop.com. 4 NS ns-1389.awsdns-45.org.
720boardshop.com. 4 NS ns-432.awsdns-54.com.
720boardshop.com. 4 NS ns-675.awsdns-20.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0