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Power Platform Community / Forums / Power Pages / Copilot Authentication...
Power Pages
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Copilot Authentication issue in power pages

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Posted on by WK-28060952-0 2
Hello,
I have created copilot agent from power pages and im using entra id with client secrets authentication in copilot but when ever im using copilot in power pages and use SharePoint as knowdege base it gives me an error,
 
An error has occurred. Error code: ValueParsingError Conversation Id: 38d53c63-ebb9-4464-afa2-ef15a9dd450b Time (UTC): 2026-06-26T12:38:39.964Z.
 
Also how can external users access this bot in power pages .
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Power Apps portals
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  • Suggested answer
    RaghavMishra Profile Picture
    RaghavMishra 261 on at

    Hi there, thanks for the details - happy to help with both parts.

    1. The error when using SharePoint as a knowledge source

    The most common reason SharePoint knowledge fails in an embedded agent is authentication, and Learn is clear on the requirements:

    • When an agent uses SharePoint as a knowledge source, generative answers are made on behalf of the signed-in user, using the authentication option you configure on the agent. SharePoint content is never anonymous - the user must be authenticated and must have access to that SharePoint content.
    • Check your agent's auth under Settings → Security → Authentication. The options are No authentication, Authenticate with Microsoft, and Authenticate manually. For SharePoint/Graph-backed knowledge, an identity that can be passed to SharePoint is required - "No authentication" can only reach public resources.
    • After changing authentication, republish the agent; changes can take time to propagate.

    2. Letting external users access the bot in Power Pages

    • Agents created from Power Pages (Set up workspace → AI assistance → Agents → Site agent) use Generic OAuth 2 with the token pass-through method. Per Learn, this enables the agent to work seamlessly with all identity providers configured for the site, including support for anonymous users.
    • You control who can use it by assigning the appropriate web roles to make the agent available to your intended visitors.
    • Note the trade-off: an anonymous/external visitor won't have a SharePoint identity, so a SharePoint knowledge source that requires sign-in won't return results for them. For external users, public knowledge sources are the reliable option.

    References:

    Found this helpful? Please mark ✅ "Does this answer your question?" so others searching for the same issue can find it quickly. A 👍 on "Was this reply helpful?" or a ♥ Like is also much appreciated!

    Raghav Mishra - LinkedIn | PowerAI Labs

  • WK-28060952-0 Profile Picture
    WK-28060952-0 2 on at
    Thanks for replying @RaghavMishra
     
    So when i was using generic o auth authentication it was showing error in my knowledge base  the below error it was showing in the generative answer topic that there are authentication error in one more sources
    Currently in copilot im using microsoft entraid with client secret authentication when i ever i logged in from
    external users in power pages and click on the copilot it shows login popup and when i logged in for external
    user it shows me user doesnt exists in this tenat.
    IMG_7232.jpeg

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