I don't know if this applies to you or not, but be aware of a known issue with OPC UA Pub/Sub App 1.20.1: In my case I was not able to source UaExpert 1.7.0, so I downgraded both Pub/Sub and Server apps to version 1.18.x, configured the connections using UaExpert 1.6.3, then restored the latest versions of Pub/Sub, Server (1.20.x).
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