Apex domains cannot have CNAME records.
Question and response
Question
dig juvo.mobi. NS
Answer
juvo.mobi. 5 NS ns-1219.awsdns-24.org.
juvo.mobi. 5 NS ns-1602.awsdns-08.co.uk.
juvo.mobi. 5 NS ns-135.awsdns-16.com.
juvo.mobi. 5 NS ns-835.awsdns-40.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0