Apex domains cannot have CNAME records.
Question and response
Question
dig photoprocontest.com. NS
Answer
photoprocontest.com. 5 NS ns-300.awsdns-37.com.
photoprocontest.com. 5 NS ns-287.awsdns-35.com.
photoprocontest.com. 5 NS ns-2041.awsdns-63.co.uk.
photoprocontest.com. 5 NS ns-1558.awsdns-02.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0