Hi,
the X20CPx4xx devices are discontinued, as I remember only Automation Runtime versions up to 3.xy were supported.
OPC UA support in Automation Runtime started with versions >= 4.xy, so unfortunately no, OPC UA is not supported with X20CP3486, you need to upgrade to an actual device like X20CP3686.
About the configuration, you’ll find information in the online help:
Best regards.