Okay, it’s what I suggested. By default Ignition’s OPC UA server only accepts secured connections at opc.tcp://10.122.220.204:62541. Unsecured discovery services can be found running at opc.tcp://10.122.220.204:62541/discovery.
Some clients are defective and can’t handle this kind of setup. If that’s the case here, you change the configuration of Ignition’s server to allow None,Basic256Sha256 for its security policies (and restart) then this client will probably be able to connect.