Apex domains cannot have CNAME records.
Question and response
Question
dig rev.accesscomm.ca. NS
Answer
rev.accesscomm.ca. 5 NS dns2.accesscomm.ca.
rev.accesscomm.ca. 5 NS dns1.accesscomm.ca.
Authority
The response has no authority records.
Additional
dns1.accesscomm.ca. 5 A 65.87.230.3
dns2.accesscomm.ca. 5 A 65.87.230.33
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0