Apex domains cannot have CNAME records.
Question and response
Question
dig leonardoargenti.com. NS
Answer
leonardoargenti.com. 5 NS ns-1196.awsdns-21.org.
leonardoargenti.com. 5 NS ns-1652.awsdns-14.co.uk.
leonardoargenti.com. 5 NS ns-1477.awsdns-56.org.
leonardoargenti.com. 5 NS ns-1972.awsdns-54.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0