Apex domains cannot have CNAME records.
Question and response
Question
dig highspot.com. NS
Answer
highspot.com. 3 NS ns-280.awsdns-35.com.
highspot.com. 3 NS ns-585.awsdns-09.net.
highspot.com. 3 NS ns-1452.awsdns-53.org.
highspot.com. 3 NS ns-1752.awsdns-27.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0