Apex domains cannot have CNAME records.
Question and response
Question
dig cadcom.tv. NS
Answer
cadcom.tv. 4 NS ns-1616.awsdns-10.co.uk.
cadcom.tv. 4 NS ns-544.awsdns-04.net.
cadcom.tv. 4 NS ns-175.awsdns-21.com.
cadcom.tv. 4 NS ns-1452.awsdns-53.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0