Apex domains cannot have CNAME records.
Question and response
Question
dig clouddesk.ch. NS
Answer
clouddesk.ch. 4 NS ns2.virtualtec.ch.
clouddesk.ch. 4 NS ns1.virtualtec.ch.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0