Apex domains cannot have CNAME records.
Question and response
Question
dig defensapublica.gov.do. NS
Answer
defensapublica.gov.do. 3 NS kiki.ns.cloudflare.com.
defensapublica.gov.do. 3 NS woz.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0