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It appears that this error code is not listed in the MS Copilot Studio documentation. You can check the documentation here: Microsoft Copilot Studio Error Codes.
I believe the error might be originating from the OpenAI API if you are utilizing the Generative Answer capability.
https://www.reddit.com/r/ChatGPT/comments/11iitcs/the_conversation_is_too_long_please_start_a_new/
If my answer helped you, could you mark it as a verified solution? This really helps other members with the same problem find the solution faster.
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