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Copilot Studio Agent not accessing SharePoint knowledge - only in Teams

Hi, I have created an agent in Copilot Studio that uses a sharepoint document library as the knowledge source. We have published our agent in Teams for the organization to use. This is been working fine since March. This week, the agent suddenly stopped being able to access knowledge from Sharepoint, but only when we use it in Teams. In the copilot studio test environment, it still works great. But in Teams, it cannot give any answers from the sharepoint library (it just says our fallback message of "I'm sorry, I do not have an answer for that. Can you try rephrasing?"). We have added a few websites to knowledge too and those still work as expected in the studio environment and in Teams.

We have not changed any permissions in Sharepoint, the documents are still viewable by all members of our organization. We have copilot studio set to authenticate with Microsoft. I asked our IT team if they changed any permission settings for Sharepoint or Teams and they have not. We have a few other agents published that we use for testing or other tasks, and they are all experiencing the same problem. Anyone else seeing this or have a solution?

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