Apex domains cannot have CNAME records.
Question and response
Question
dig h2dsoftware.com. NS
Answer
h2dsoftware.com. 2 NS ns-1141.awsdns-14.org.
h2dsoftware.com. 2 NS ns-781.awsdns-33.net.
h2dsoftware.com. 2 NS ns-1029.awsdns-00.org.
h2dsoftware.com. 2 NS ns-1452.awsdns-53.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0