Apex domains cannot have CNAME records.
Question and response
Question
dig loyola.edu.do. NS
Answer
loyola.edu.do. 4 NS ns-641.awsdns-16.net.
loyola.edu.do. 4 NS ns-1668.awsdns-16.co.uk.
loyola.edu.do. 4 NS ns-317.awsdns-39.com.
loyola.edu.do. 4 NS ns-1265.awsdns-30.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0