Apex domains cannot have CNAME records.
Question and response
Question
dig ascendon.tv. NS
Answer
ascendon.tv. 5 NS ns-1726.awsdns-23.co.uk.
ascendon.tv. 5 NS ns-1213.awsdns-23.org.
ascendon.tv. 5 NS ns-467.awsdns-58.com.
ascendon.tv. 5 NS ns-601.awsdns-11.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0