Apex domains cannot have CNAME records.
Question and response
Question
dig securitycoverage.com. NS
Answer
securitycoverage.com. 2 NS ns-1131.awsdns-13.org.
securitycoverage.com. 2 NS ns-56.awsdns-07.com.
securitycoverage.com. 2 NS ns-750.awsdns-29.net.
securitycoverage.com. 2 NS ns-1892.awsdns-44.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0