Apex domains cannot have CNAME records.
Question and response
Question
dig edesur.com.do. NS
Answer
edesur.com.do. 5 NS ns4-01.azure-dns.info.
edesur.com.do. 5 NS ns3-01.azure-dns.org.
edesur.com.do. 5 NS ns1-01.azure-dns.com.
edesur.com.do. 5 NS ns2-01.azure-dns.net.
Authority
The response has no authority records.
Additional
ns2-01.azure-dns.net. 4 A 150.171.21.1
ns2-01.azure-dns.net. 4 AAAA 2620:1ec:8ec:700:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0