Apex domains cannot have CNAME records.
Question and response
Question
dig ad-merumaga.com. NS
Answer
ad-merumaga.com. 5 NS ns-2000.awsdns-58.co.uk.
ad-merumaga.com. 5 NS ns-1682.awsdns-18.co.uk.
ad-merumaga.com. 5 NS ns-1516.awsdns-61.org.
ad-merumaga.com. 5 NS ns-1604.awsdns-08.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0