Can ACS Bots Join Microsoft Teams Meetings and Trigger Webhooks for Real-Time Audio Streaming?

I've spent over 15 hours trying to get an Azure Communication Services (ACS) bot to both join a Microsoft Teams meeting and trigger the media streaming webhook to access real-time audio for transcription.

Here’s what I’ve tried:

1. Following this GitHub sample: https://github.com/Azure-Samples/acs-teams-recording It says the bot should auto-join a Teams meeting if added by its ACS ID or phone number.
   • I tried adding the ACS user ID through the Teams UI — it says “no matches found.”
   • Note: The ACS resource has VoIP and Chat enabled, and a system-assigned identity and I configured the event subscription for /acs/events.
2. Graph API attempt to create the meeting and add the ACS user as an attendee:

      bash
      Copy
      curl -X POST https://graph.microsoft.com/v1.0/users/{userId}/onlineMeetings ...
   

   • I used "identityProvider": "ACS" in the request body for the attendee and included the correct acs bot id.
   • Got error: "Invalid meeting attendee"
3. Server-side SDK (Call Automation)
   • I can create a new call and see it “answered” on the provided dashboard from the github repo.
   • But I cannot join an existing Teams meeting using that SDK — there doesn’t seem to be an API for it.
   • If I invite a Teams user to the ACS call, no ring/notification happens on their end.
4. Client-side SDK
   • Using the browser SDK, the ACS bot can join a Teams meeting by meeting link.
   • However, the webhook is not triggered, and I can't access media streams.
   • I believe audio streams are not exposed in the client SDK anymore due to privacy restrictions?

What I Need to Know:

Is it currently possible to use Azure Communication Services to:

Join an actual Teams meeting (not a separate call), and

Trigger the media streaming webhook (for real-time transcription)?

If not, is this a known limitation?

I would love to find any working solution — whether through ACS, Graph API, or other supported methods — that allows me to get real-time audio or transcription streams from regular Microsoft Teams meetings.