Apex domains cannot have CNAME records.
Question and response
Question
dig tarotkarten.net. NS
Answer
tarotkarten.net. 4 NS ns-1643.awsdns-13.co.uk.
tarotkarten.net. 4 NS ns-565.awsdns-06.net.
tarotkarten.net. 4 NS ns-595.awsdns-10.net.
tarotkarten.net. 4 NS ns-977.awsdns-58.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0