Copilot Studio Agents connected to a Fabric Data Agent fails

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Posted on by donniekerr

A Copilot Studio Agent, connected to a Fabric Data Agent, fails to connect when published to m365 Copilot but they connect when opened in Teams.

Agent response with 'Sorry, I wasn't able to respond to that. Is there something else I can help with?' in m365 while same agent responds correctly when same prompt is used with same agent in Teams.

There is no error, so I cannot tell you why it fails.

Just reporting as a potential bug.

Also, there is ongoing bug with the '/' command in the instructions to select tools or agents fails and the agent cannot be published. If you remove the tag, the agent can be published and works. These are related bugs.

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Publish & channel management

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Robu1 1,459 Super User 2025 Season 2 on at

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Hi donniekerr,

Thank your for choosing Power Platform Community.

-If Fabric Data Agent fails in M365 Copilot but works in Teams- Ensure the Fabric Agent returns valid JSON (not HTML). Enable Generative Orchestration in Copilot Studio. Try connecting the Fabric Agent directly instead of via MCP connector.

-If the agent responds with fallback message in M365 Copilot - This may be due to response formatting or authentication differences. Test the agent directly in Fabric to confirm output.

-When publishing fails when using / command in instructions Avoid using slash-prefixed tags in tool/agent instructions. Remove the / to allow publishing.

📚 Microsoft Learn & Community Resources
Microsoft Fabric: Connect Data Agents to Teams with Copilot Studio - YouTube

Consume a data agent in Microsoft Copilot Studio (preview) - Microsoft Fabric | Microsoft Learn

🏷️ Please tag me @Robu1 if you still have any queries related to the solution or issue persists.
✅ Please click Accept as solution if my post helped you solve your issue and help others who will face the similar issue in future.
❤️ Please consider giving it a Like, If the solution was useful in other ways.

If this fixes the issue, please mark as resolved to help others with find it.

Happy to help
Robu1
SuperUser|Moderator
Season 2:2025

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GrusCanadensis 3 on at

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@donniekerr does your test window work?

@Robu1 - I’m experiencing the same issue. I’ve followed your troubleshooting steps and reviewed the links you shared, but I wasn't able to resolve the problem. Here is more context about what I'm seeing from our setup.

If Fabric Data Agent fails in M365 Copilot but works in Teams- Ensure the Fabric Agent returns valid JSON (not HTML). Enable Generative Orchestration in Copilot

Studio. Try connecting the Fabric Agent directly instead of via MCP connector.

Our agent works in Teams, but not in 365. The agent also doesn’t respond in the test window. For example, in the YouTube video provided, if we set it up the same way, my question in the blue box would go to the data agent, but it never returns an answer. Here is a screenshot for context of the test pane I'm talking about:

I’ve confirmed that the data agent in Fabric is receiving the request and sending a response. I can see it in the activity log. However, no answers appear in either 365 or the test window. I do see answers in Teams.

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donniekerr 59 on at

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Yes, it works fine for me in Copilot Studio Test and in Teams. Just not via m365 Copilot UI

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MP-18091446-0 2 on at

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Robu1 I am having similar issues with connecting a Fabric Data Agent. For me the Data Agent is answering the questions but not displaying the answers in the test Window. Also, once I connected to the Data Agent, simple greeting prompts immediately get cancelled, also somtimes the activity screen will say "Waiting for User" but there is no question to follow up on.

This behavior started once I connected to the Fabric Data Agent

Output on the left is correct, but no Message is returned in the test window:

Simple prompts are immediately cancelled:

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AM-22100906-0 5 on at

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Hi @MP-18091446-0, @donniekerr did you have any progress in solving this ? We have a similar issue, but with a custom agent - https://community.powerplatform.com/forums/thread/details/?threadid=1c17df0d-9cae-f011-bbd3-7ced8d1ab86c. I was wondering if there is some common pattern here, as we exhausted all our hunches as well

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MD-28111408-0 2 on at

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Hi @MP-18091446-0, @AM-22100906-0, did you find any solution? We have started to building the Agent that connected to Fabric and almost in all cases I have the same issue - no output rendered, Even the Fabric output is simple text.

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