I have connection between studio5000 emulator and Ignition via RSLinx OPC Server.
I can read and write tags in gateway.
However, I am unable to read or write tags in designer.
Does Subscribe work in the quick client instead of Read?
If this is an OPC UA connection, set the log level for the loggers you get searching "OpcUaSubscriptionManager" and "OpcUaSubscriptionSynchronizer" to TRACE and then edit/save that connection. There should be some logs once the subscriptions are attempted that explain what's failing.
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So glad you asked this question, the unknown_last known value was driving me crazy. Thanks for the solution