Apex domains cannot have CNAME records.
Question and response
Question
dig ms-in-berlin.com. NS
Answer
ms-in-berlin.com. 5 NS ns-266.awsdns-33.com.
ms-in-berlin.com. 5 NS ns-1349.awsdns-40.org.
ms-in-berlin.com. 5 NS ns-478.awsdns-59.com.
ms-in-berlin.com. 5 NS ns-1921.awsdns-48.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0