A different ISTag is being generated though all SPE instances are sending the ICAP OPTIONS requests with the same service name, and using the same policy, license, and definitions.
Same ISTag value should be returned in ICAP OPTIONS response from all the SPE instances.
There is a hotfix available for this issue.
Download the attached hotfix to this document and follow the instructions in the Read Me file.
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This will clear the history and restart the chat.