Apex domains cannot have CNAME records.
Question and response
Question
dig pamf.gov.do. NS
Answer
pamf.gov.do. 4 NS dns20.midominio.do.
pamf.gov.do. 4 NS dns30.midominio.do.
pamf.gov.do. 4 NS dns40.midominio.do.
pamf.gov.do. 4 NS dns10.midominio.do.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0