Help in finding the namespace-uri for the root-node parameter I need to configure for the OPC-UA Extractor in the config.yml

Customer is using UAExpert and for the same namespaceindex of the node I'm interested in which is 2 in the Attributes section, I can see 3 namespaces in the left side with the hierarchy: one is the default base opcua.../UA, the other one is an urn and the third one is Thingworx Kepware Server. For each one, when selected, I can explore the node I'm interested in. I still don't know what uri I should use and if I should add the namespace index 2 to it in the config file under extraction-> root-node-> namespace-uri . Customer can connect to the server but it gives error on the fact that it doesn't find that uri given in the 3 options with are the namespace maps I guess.