Apex domains cannot have CNAME records.
Question and response
Question
dig indotel.gov.do. NS
Answer
indotel.gov.do. 4 NS dns20.midominio.do.
indotel.gov.do. 4 NS dns10.midominio.do.
indotel.gov.do. 4 NS dns40.midominio.do.
indotel.gov.do. 4 NS dns30.midominio.do.
Authority
The response has no authority records.
Additional
dns30.midominio.do. 2 A 162.251.82.118
dns30.midominio.do. 2 A 162.251.82.119
dns30.midominio.do. 2 A 162.251.82.246
dns30.midominio.do. 2 A 162.251.82.247
dns40.midominio.do. 2 A 162.251.82.124
dns40.midominio.do. 2 A 162.251.82.125
dns40.midominio.do. 2 A 162.251.82.252
dns40.midominio.do. 2 A 162.251.82.253
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0