Apex domains cannot have CNAME records.
Question and response
Question
dig evsrv.de. NS
Answer
evsrv.de. 2 NS ns14.ovh.net.
evsrv.de. 2 NS dns14.ovh.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0