Apex domains cannot have CNAME records.
Question and response
Question
dig click2cast.com. NS
Answer
click2cast.com. 4 NS ns-735.awsdns-27.net.
click2cast.com. 4 NS ns-1546.awsdns-01.co.uk.
click2cast.com. 4 NS ns-1824.awsdns-36.co.uk.
click2cast.com. 4 NS ns-684.awsdns-21.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0