RSLogix OPC server tags can not be read/write in desginer

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?

No it shows uncertain_initial value

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.

I solved it by changing tag group OPC data mode from subscribe to polled

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So glad you asked this question, the unknown_last known value was driving me crazy. Thanks for the solution