Apex domains cannot have CNAME records.
Question and response
Question
dig biomassaforestale.org. NS
Answer
biomassaforestale.org. 5 NS ns-640.awsdns-16.net.
biomassaforestale.org. 5 NS ns-1517.awsdns-61.org.
biomassaforestale.org. 5 NS ns-9.awsdns-01.com.
biomassaforestale.org. 5 NS ns-1506.awsdns-60.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0