Apex domains cannot have CNAME records.
Question and response
Question
dig tucasapopular.net.do. NS
Answer
tucasapopular.net.do. 5 NS ns-1153.awsdns-16.org.
tucasapopular.net.do. 5 NS ns-1987.awsdns-56.co.uk.
tucasapopular.net.do. 5 NS ns-281.awsdns-35.com.
tucasapopular.net.do. 5 NS ns-598.awsdns-10.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0