Apex domains cannot have CNAME records.
Question and response
Question
dig opuscapita.net. NS
Answer
opuscapita.net. 1 NS ns2-35.azure-dns.net.
opuscapita.net. 1 NS ns4-35.azure-dns.info.
opuscapita.net. 1 NS ns1-35.azure-dns.com.
opuscapita.net. 1 NS ns3-35.azure-dns.org.
Authority
The response has no authority records.
Additional
ns1-35.azure-dns.com. 3 A 150.171.10.35
ns3-35.azure-dns.org. 3 A 13.107.222.35
ns4-35.azure-dns.info. 3 A 13.107.206.35
ns1-35.azure-dns.com. 3 AAAA 2603:1061:0:10:0:0:0:23
ns3-35.azure-dns.org. 3 AAAA 2a01:111:4000:10:0:0:0:23
ns4-35.azure-dns.info. 3 AAAA 2620:1ec:bda:10:0:0:0:23
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0