Apex domains cannot have CNAME records.
Question and response
Question
dig icontroller.eu. NS
Answer
icontroller.eu. 5 NS ns-150.awsdns-18.com.
icontroller.eu. 5 NS ns-1123.awsdns-12.org.
icontroller.eu. 5 NS ns-820.awsdns-38.net.
icontroller.eu. 5 NS ns-1538.awsdns-00.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0