Apex domains cannot have CNAME records.
Question and response
Question
dig hd2caresupportservices.com. NS
Answer
hd2caresupportservices.com. 5 NS ns-1168.awsdns-18.org.
hd2caresupportservices.com. 5 NS ns-1443.awsdns-52.org.
hd2caresupportservices.com. 5 NS ns-1860.awsdns-40.co.uk.
hd2caresupportservices.com. 5 NS ns-623.awsdns-13.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0