Apex domains cannot have CNAME records.
Question and response
Question
dig trexalivo.org. NS
Answer
trexalivo.org. 5 NS ns-1842.awsdns-38.co.uk.
trexalivo.org. 5 NS ns-422.awsdns-52.com.
trexalivo.org. 5 NS ns-444.awsdns-55.com.
trexalivo.org. 5 NS ns-928.awsdns-52.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0