Apex domains cannot have CNAME records.
Question and response
Question
dig miucateci.edu.do. NS
Answer
miucateci.edu.do. 4 NS ns1-06.azure-dns.com.
miucateci.edu.do. 4 NS ns3-06.azure-dns.org.
miucateci.edu.do. 4 NS ns2-06.azure-dns.net.
miucateci.edu.do. 4 NS ns4-06.azure-dns.info.
Authority
The response has no authority records.
Additional
ns1-06.azure-dns.com. 4 A 13.107.236.6
ns2-06.azure-dns.net. 4 A 150.171.21.6
ns3-06.azure-dns.org. 4 A 204.14.183.6
ns4-06.azure-dns.info. 4 A 208.84.5.6
ns1-06.azure-dns.com. 4 AAAA 2603:1061:0:700:0:0:0:6
ns2-06.azure-dns.net. 4 AAAA 2620:1ec:8ec:700:0:0:0:6
ns3-06.azure-dns.org. 4 AAAA 2a01:111:4000:700:0:0:0:6
ns4-06.azure-dns.info. 4 AAAA 2620:1ec:bda:700:0:0:0:6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0