Apex domains cannot have CNAME records.
Question and response
Question
dig ferragemda7.com. NS
Answer
ferragemda7.com. 5 NS ns-865.awsdns-44.net.
ferragemda7.com. 5 NS ns-1729.awsdns-24.co.uk.
ferragemda7.com. 5 NS ns-1739.awsdns-25.co.uk.
ferragemda7.com. 5 NS ns-1835.awsdns-37.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0