Yes, I did a research and we did not find such APIs that could get the active speaker ID.
Our forum is mainly focused on the general issue of Microsoft Teams troubleshooting. Considering your question is also related to Teams API development, I will also add teams-app-dev tag to your thread. And let us see if there is anyone have some ideas about it.
From our Teams client, we could see the active speaker directly when join Teams. A circle will appear around the active speakers when someone is speaking in Teams meeting.
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