Apex domains cannot have CNAME records.
Question and response
Question
dig allianz-ceema.com. NS
Answer
allianz-ceema.com. 5 NS ns1.allianz-services.sk.
allianz-ceema.com. 5 NS ns2.allianz-services.sk.
Authority
The response has no authority records.
Additional
ns1.allianz-services.sk. 5 A 91.206.86.238
ns2.allianz-services.sk. 5 A 91.206.87.237
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0