Apex domains cannot have CNAME records.
Question and response
Question
dig datamatrixgo.com. NS
Answer
datamatrixgo.com. 5 NS ns-910.awsdns-49.net.
datamatrixgo.com. 5 NS ns-41.awsdns-05.com.
datamatrixgo.com. 5 NS ns-446.awsdns-55.com.
datamatrixgo.com. 5 NS ns-1419.awsdns-49.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0