RTMS behavior differences between App Auto-Start vs manually starting RTMS via API

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Issue: Manually starting RTMS only works when the Host is the first to join (an instance of) the Meeting. If a Participant (non-Host) joins the meeting first, RTMS doesn’t start.

Details:

  • We have a User Manged General App (RTMS app) set up to send Meeting and RTMS events to a webhook.
  • The webhook consumer can be configured to either manually start RTMS events or to wait for RTMS events.
  • RTMS is manually started through a Server-to-Server App (StoS app) that requests an Access Token and uses it to start RTMS (for the RTMS app) via API call.
  • The StoS app has no Events, and has the following Scopes:
    meeting:read:meeting:admin
    meeting:update:participant_rtms_app_status:admin
    Note: I couldn’t find the non-admin versions of these scopes

Auto-Start RTMS Test:

  • We add the Zoom User to the RTMS app.
  • We add the RTMS app to the Zoom Users auto-start list (Settings >> Zoom Apps >> Meetings >> Auto-start apps that access shared realtime meeting content).
  • We configure our webhook consumer to wait for RTMS events.
  • We schedule a meeting with the Zoom User as Host.
  • When anyone (Host or non-Zoom User) joins the meeting, our webhook consumer receives a meeting.started event, followed by a meeting.rtms_started event, and all is good.

Manual RTMS Test:

  • We add the Zoom User to the RTMS app.
  • We configure our webhook consumer to manually start RTMS.
  • We schedule a meeting with the Zoom User as Host.
  • When anyone joins the meeting, our webhook consumer receives a meeting.started event.
  • Our webhook consumer requests an Access Token, through the StoS app (Basic Authentication Header). POST https://zoom.us/oauth/token?grant_type=account_credentials&account_id=\*\*\*\*\*\*
  • Our webhook consumer uses the Bearer token to call the Zoom API v2 (action = “start” body…) PATCH https://api.zoom.us/v2/live_meetings/"+ meetingid + "/rtms_app/status
  • If the Host joins the meeting first, the webhook consumer recieves the meeting.rtms_started event.
  • If a Participant (!= Host, != Zoom User) joins first, RTMS doesn’t start.

Everything is working when we use auto-start, but I suspect that there may be a fix for our manual RTMS start issue.

I’d appreciate any thoughts you might be able to offer.