Apex domains cannot have CNAME records.
Question and response
Question
dig legekassen.com. NS
Answer
legekassen.com. 5 NS ns-1960.awsdns-53.co.uk.
legekassen.com. 5 NS ns-574.awsdns-07.net.
legekassen.com. 5 NS ns-913.awsdns-50.net.
legekassen.com. 5 NS ns-1488.awsdns-58.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0