Apex domains cannot have CNAME records.
Question and response
Question
dig eikonitalia.com. NS
Answer
eikonitalia.com. 5 NS ns2.eikonitalia.com.
eikonitalia.com. 5 NS ns1.eikonitalia.com.
Authority
The response has no authority records.
Additional
ns1.eikonitalia.com. 5 A 139.99.68.240
ns2.eikonitalia.com. 5 A 51.79.234.135
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0