Copilot studio agent is working in office 365 but is not working in Team channel

Question

After creating the agent in Copilot Studio, I added it to both the Teams channel and Office 365. The agent works correctly on Office 365, but in the Teams channel we encounter the following error: 'Sorry, something unexpected happened. We’re looking into it. Error code: SystemError. Conversation ID: xxxxxxxxx'. Kindly advise."

Answer 1

Hello Ahmed AbdelMoneim,
This is a known scenario where an agent works correctly in Copilot for Office 365 but fails in Microsoft Teams with a generic SystemError because Teams enforces additional requirements that are not strictly validated in Copilot Studio. Common causes include Teams app permission policies blocking the bot, incomplete Teams channel configuration requiring re-publishing, missing or broken Conversation Start (Greeting) topics, and stricter enforcement of connector or flow permissions for Teams users.
Resolving the issue typically involves ensuring the Teams channel is properly enabled and published, verifying bot permissions in Teams Admin Center, confirming a valid greeting topic exists, re-adding the Teams channel if needed, and checking user access to all connectors or data sources used by the agent.
Reference Thread: -
1.https://learn.microsoft.com/en-us/answers/questions/5558859/agent-is-not-working-in-teams
2.https://learn.microsoft.com/en-us/answers/questions/4431363/copilot-studio-agent-cannot-send-messages-in-team