Apex domains cannot have CNAME records.
Question and response
Question
dig dogado.de. NS
Answer
dogado.de. 5 NS cns3.cloudpit.io.
dogado.de. 5 NS cns1.cloudpit.de.
dogado.de. 5 NS cns2.cloudpit.com.
Authority
The response has no authority records.
Additional
cns1.cloudpit.de. 5 A 109.237.142.8
cns2.cloudpit.com. 5 A 148.251.254.105
cns1.cloudpit.de. 5 AAAA 2a01:64c0:0:5000:0:0:0:8
cns2.cloudpit.com. 5 AAAA 2a01:4f8:2b02:a88:0:0:0:105
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0