Apex domains cannot have CNAME records.
Question and response
Question
dig minerd.net.do. NS
Answer
minerd.net.do. 5 NS ns2-02.azure-dns.net.
minerd.net.do. 5 NS ns3-02.azure-dns.org.
minerd.net.do. 5 NS ns4-02.azure-dns.info.
minerd.net.do. 5 NS ns1-02.azure-dns.com.
Authority
The response has no authority records.
Additional
ns1-02.azure-dns.com. 5 A 13.107.236.2
ns1-02.azure-dns.com. 5 AAAA 2603:1061:0:700:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0