Apex domains cannot have CNAME records.
Question and response
Question
dig my.cam. NS
Answer
my.cam. 4 NS ns101.acwebconnecting.com.
my.cam. 4 NS ns102.acwebconnecting.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0