Apex domains cannot have CNAME records.
Question and response
Question
dig hec.checkpoint-gov.com. NS
Answer
hec.checkpoint-gov.com. 4 NS ns-1222.awsdns-24.org.
hec.checkpoint-gov.com. 4 NS ns-8.awsdns-01.com.
hec.checkpoint-gov.com. 4 NS ns-530.awsdns-02.net.
hec.checkpoint-gov.com. 4 NS ns-1713.awsdns-22.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0