CS agent OK in M365 Copilot; Teams chat silent / no Studio session

The agent working in Microsoft 365 Copilot but remaining silent in a personal Teams chat indicates that the published agent is healthy while the Teams channel or app route is not reaching Copilot Studio. Republish the latest version, then verify that Microsoft Teams and Microsoft 365 Copilot is connected under Channels. Use the channel’s availability options to confirm the agent is shared with the affected user or group and that the Teams app was added from the current published package. In the Teams admin center, confirm the app is allowed by the organization’s app permission and setup policies. Remove the personal-chat installation, sign out of Teams, reset or reinstall Teams, and add the agent again. Test in Teams on the web to separate client caching from policy. Because no Copilot Studio session is created, focus on channel publication, app availability, and Teams policy before debugging topics or orchestration.