Hello,

I reviewed the vercel/chat repository, especially the Teams adapter, and I have a question about Teams user authentication.

From what I understood, @chat-adapter/teams appears to handle bot authentication through Azure Bot Service / Bot Framework using settings such as TEAMS_APP_ID, TEAMS_APP_PASSWORD, and TEAMS_APP_TENANT_ID. However, I could not find clear support for Teams user SSO or for retrieving a Microsoft / Entra ID JWT for the signed-in Teams user.

Our use case is the following:

• authenticate a Teams user
• retrieve the user's Microsoft / Entra ID JWT
• ideally from a bot interaction, or otherwise understand whether this must be done through a Teams Tab with microsoftTeams.getAuthToken()

I did not find obvious support in the adapter for things such as:

• TeamsSSOTokenExchangeMiddleware
• OAuthPrompt
• signin/tokenExchange
• Bot Framework user token retrieval flows

Could you please clarify:

1. Is this scenario supported natively today by @chat-adapter/teams?
2. If not, what is the recommended approach with this SDK?

Thank you.