Import variables from Driver OPC UA Client

Import variables from Driver OPC UA Client

Hi Everyone
I am facing an issue when using OPC UA Server and OPC UA Client between applications like Matrikon or KepserverEX, where all communication and variable read/write operations can be easily performed. However, when I connect to Zenon via the OPC UA Client Driver, although they are pointed to each other via the Discovery URL, it is impossible to import or add variables.
Could you please explain the cause and suggest a solution?
Thank you for your help.