Apex domains cannot have CNAME records.
Question and response
Question
dig ieesudaam.edu.do. NS
Answer
ieesudaam.edu.do. 2 NS ns-1354.awsdns-41.org.
ieesudaam.edu.do. 2 NS ns-318.awsdns-39.com.
ieesudaam.edu.do. 2 NS ns-723.awsdns-26.net.
ieesudaam.edu.do. 2 NS ns-1810.awsdns-34.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0