Apex domains cannot have CNAME records.
Question and response
Question
dig os6principiosdariqueza.com. NS
Answer
os6principiosdariqueza.com. 5 NS ns-1893.awsdns-44.co.uk.
os6principiosdariqueza.com. 5 NS ns-265.awsdns-33.com.
os6principiosdariqueza.com. 5 NS ns-776.awsdns-33.net.
os6principiosdariqueza.com. 5 NS ns-1405.awsdns-47.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0