Copilot Studio “SystemError” – Unexpected Error During Conversation

Question

Hello,

I am using Microsoft Copilot Studio and encountering the following error:

“Sorry, something unexpected happened. We’re looking into it. Error code: SystemError.”

Details:

• Conversation ID: a:1eg__sIUqEfoVS-FT2ptjzXV6lqilHo8kEo-yYYFRO2AjlPnTuQMl-hNa-TKWlFKZdacMXikr4biz-DtWDJIzchHFx2EEk1Kg0_GjVv51UAiSFaBTEHwcYapV3L26ofl9
• Time (UTC): April 1, 2026, 11:08:35 AM

This error occurs while interacting with the Copilot agent in MS Teams app

Could anyone help identify:

1. Possible root causes of this SystemError
2. Recommended troubleshooting steps
3. Whether this is a known issue or service-related problem

Any guidance would be appreciated.

Thanks in advance

Answer 1

Just following up on the answer AI-assistant shared recently. Could you please let me know if it resolved your issue, or if you need any further clarification?

Answer 2

SystemError in Copilot Studio is a generic platform error that indicates a backend or configuration problem that can’t be diagnosed from the client alone.

From the documented behavior:

• SystemError is raised when a system-level issue occurs in Copilot Studio and doesn’t produce a detailed user-facing message.
• In Teams, it can also appear when Teams is still using an outdated or inconsistent version of the agent after a publish/republish.
• For packaged/managed agents (like Store Operations Agent), SystemError typically indicates a backend or configuration issue that requires validation or support-assisted remediation.

Given that this occurs while interacting with the agent in Microsoft Teams, the most relevant root causes and steps are:

1. Possible root causes

• Transient backend/platform issue in Copilot Studio.
• Teams using a stale or partially updated configuration of the agent after a recent publish or configuration change.
• Agent not fully or correctly published in Copilot Studio.
• Environment or solution setup not fully completed (for managed/solution-based agents).

2. Recommended troubleshooting steps

In Copilot Studio:

1. Verify the agent is successfully published.
   • If not, publish it again.
2. If the agent is part of a managed/solution-based setup (for example, Store Operations Agent), verify:
   • Required flows are enabled.
   • Connection references are valid.
   • The solution/agent setup has completed without errors.
3. If the agent was recently imported or updated, republish it to ensure the latest version is available.

In Microsoft Teams:

1. Refresh the agent configuration used by Teams:
   • In the Microsoft Teams admin center, locate the agent app, disable it, wait a few seconds, then re-enable it.
   • In Copilot Studio, turn off the Teams channel for the agent, save, then turn it back on.
   • Republish the agent after re-enabling the Teams channel.
2. After these steps, retry the conversation in Teams after a short wait to rule out propagation delays.
3. Whether this is a known/service-related issue

• SystemError is documented as a generic system error in Copilot Studio that requires backend or configuration validation and may need support-assisted remediation.
• There is a known limitation where Teams can continue using an older agent configuration after republish, which can cause a generic SystemError during execution until the configuration is refreshed.

If the error persists after republishing and refreshing the Teams channel/app, the next step is to contact Microsoft Support and provide:

• Conversation ID
• Agent ID
• Exact UTC time of the error so the backend logs can be investigated.

---

References:

• Understand error codes
• Connect and configure an agent for Teams and Microsoft 365
• Troubleshoot Store Operations Agent (preview)