Copilot Agent Not Responding in Microsoft Teams

Question

Copilot Agent Not Responding in Microsoft Teams

Hareesh A 0

After uploading a file in the Copilot agent chat in Microsoft Teams, the agent gets stuck and does not respond. Also the same issue started occurring after configuring the Connection Manager setup for the agent.

Sayali-MSFT 5,361 Reputation points Microsoft External Staff Moderator

2026-03-10T07:43:18.4833333+00:00

Hello **Hareesh A,
**Thank you for reaching out! To assist you better, could you please provide more details or clarify the issue you are experiencing? Specifically, it would be helpful if you could share:

Reproduction Steps: A detailed description of the steps you took to encounter the issue.

Business Scenario: Could you describe the scenario or context in which this issue occurred?

Documentation Reference: Any specific documentation or guide you were following when you encountered this issue.

Any additional information will help us understand your situation and provide a more accurate response.

Looking forward to your reply!
Hareesh A 0 Reputation points

2026-03-10T07:55:12.9733333+00:00

Hi Sayali,

Please find the details below.

Business Scenario: I created an agent in Copilot Studio and published it. After publishing, I enabled the Microsoft Teams channel and tested the agent in Teams chat.

Initially, the agent was responding correctly to my questions in Teams. However, when I uploaded a file in the chat and asked a question related to the file, the agent got stuck and did not respond. Interestingly, the same agent continued to work correctly from Copilot Studio, and other users were still able to receive responses from the agent through Teams.

To troubleshoot, I created a new agent in Copilot Studio, published it, and enabled the Teams channel again.

Reproduction Steps:

Create an agent in Copilot Studio.

Publish the agent.

Enable the Microsoft Teams channel.

Open the agent chat in Microsoft Teams.

Send a message to the agent – the agent responds correctly.

Upload a file in the Teams chat and ask a question related to the file – the agent gets stuck and does not respond.

In the new agent, I added a sub-agent via A2A.

During this process, it prompted me to configure a Connection, so I configured the Connection Manager.

After configuring the connection, the agent stopped responding from Teams entirely.

Expected Behavior: The agent should respond normally in Teams, including when a file is uploaded or after configuring connections.

Actual Behavior: The agent either gets stuck when a file is uploaded or stops responding in Teams after configuring the connection.

Please let me know if you need additional logs, screenshots, or configuration details.

1 answer

Your answer

Sayali-MSFT 5,361 Reputation points Microsoft External Staff Moderator

2026-03-10T07:43:18.4833333+00:00

Hello **Hareesh A,
**Thank you for reaching out! To assist you better, could you please provide more details or clarify the issue you are experiencing? Specifically, it would be helpful if you could share:

Reproduction Steps: A detailed description of the steps you took to encounter the issue.

Business Scenario: Could you describe the scenario or context in which this issue occurred?

Documentation Reference: Any specific documentation or guide you were following when you encountered this issue.

Any additional information will help us understand your situation and provide a more accurate response.

Looking forward to your reply!
Hareesh A 0 Reputation points

2026-03-10T07:55:12.9733333+00:00

Hi Sayali,

Please find the details below.

Business Scenario: I created an agent in Copilot Studio and published it. After publishing, I enabled the Microsoft Teams channel and tested the agent in Teams chat.

Initially, the agent was responding correctly to my questions in Teams. However, when I uploaded a file in the chat and asked a question related to the file, the agent got stuck and did not respond. Interestingly, the same agent continued to work correctly from Copilot Studio, and other users were still able to receive responses from the agent through Teams.

To troubleshoot, I created a new agent in Copilot Studio, published it, and enabled the Teams channel again.

Reproduction Steps:

Create an agent in Copilot Studio.

Publish the agent.

Enable the Microsoft Teams channel.

Open the agent chat in Microsoft Teams.

Send a message to the agent – the agent responds correctly.

Upload a file in the Teams chat and ask a question related to the file – the agent gets stuck and does not respond.

In the new agent, I added a sub-agent via A2A.

During this process, it prompted me to configure a Connection, so I configured the Connection Manager.

After configuring the connection, the agent stopped responding from Teams entirely.

Expected Behavior: The agent should respond normally in Teams, including when a file is uploaded or after configuring connections.

Actual Behavior: The agent either gets stuck when a file is uploaded or stops responding in Teams after configuring the connection.

Please let me know if you need additional logs, screenshots, or configuration details.

Answer 1

Hello Hareesh A,
The agent can appear to hang in Microsoft Teams due to two common causes: file uploads and authentication introduced by connections or A2A (agent-to-agent) configurations. When a user uploads a file in Teams, the agent receives a reference to the file rather than the file itself. If the agent is not explicitly designed to process attachments or resolve that reference, the orchestrator waits indefinitely for tool resolution, causing the conversation to stall. Similarly, when a connection or sub-agent is added, the agent may switch to authenticated execution mode, requiring Teams SSO or an OAuth handshake. If authentication cannot complete, the agent never reaches execution and stops responding. These issues often do not appear in the Copilot Studio test pane because it uses a different runtime, bypasses some authentication checks, and handles uploads differently.
As a result, flows that work in Copilot Studio may fail silently in Teams. The recommended mitigations include guarding against file uploads if they are not supported, validating authentication flows for connections, and adding fallback responses to avoid silent failures.

Hareesh A 0 Reputation points

2026-03-26T12:38:24.4133333+00:00

How to make it respond again ? also is there any fix to make sure atleast the agent responds with any error message

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Copilot Agent Not Responding in Microsoft Teams

1 answer

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