Apex domains cannot have CNAME records.
Question and response
Question
dig nurecoservizi.com. NS
Answer
nurecoservizi.com. 5 NS ns-412.awsdns-51.com.
nurecoservizi.com. 5 NS ns-235.awsdns-29.com.
nurecoservizi.com. 5 NS ns-98.awsdns-12.com.
nurecoservizi.com. 5 NS ns-641.awsdns-16.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0