I'm trying to read value from OPC UA Server. I'm using UaExpert to verify that the node is accessible. As shown in the attached image the status is good. I tried using nodeId as `/Channel/Spindle/actSpeed[u1,1]` and as `ns=0;i=84`, but even though the result says Succeeded the StatusCode is BadNodeIdUnknown. What is the correct nodeId I need to use?

var client = new EasyUAClient();
string serverUrl = "opc.tcp://192.168.214.1:4840";
var readRequests = new List
{    
    // did not work
    new(new UAEndpointDescriptor(serverUrl), new UANodeDescriptor("/Channel/Spindle/actSpeed[u1,1]")),
    // did not work
    new(new UAEndpointDescriptor(serverUrl), new UANodeDescriptor("ns=0;i=84")),
};
var values = client.ReadMultiple([.. readRequests]);