Apex domains cannot have CNAME records.
Question and response
Question
dig anydns.cloud. NS
Answer
anydns.cloud. 1 NS dns.t-systems.at.
anydns.cloud. 1 NS ns1.anydns.cloud.
anydns.cloud. 1 NS dns.tsadns.eu.
Authority
The response has no authority records.
Additional
dns.tsadns.eu. 1 A 212.31.88.120
dns.t-systems.at. 1 A 212.31.86.120
ns1.anydns.cloud. 1 A 192.174.68.120
dns.t-systems.at. 1 AAAA 2001:9d0:0:1:0:0:0:120
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0