Apex domains cannot have CNAME records.
Question and response
Question
dig datex.ca. NS
Answer
datex.ca. 4 NS ns-1845.awsdns-38.co.uk.
datex.ca. 4 NS ns-1230.awsdns-25.org.
datex.ca. 4 NS ns-412.awsdns-51.com.
datex.ca. 4 NS ns-528.awsdns-02.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0