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WebRTC session not found: rtc

I working on a custom WebRTC Wowza player, and a connection is established correctly, but before trying to play the video stream - I am getting a status 507 that says “WebRTC session not found”.
What should be the parameter for the WebRTC session? Is it available to copy and paste somewhere in the Wowza Cloud dashboard, or should it be fetched dynamically on connection?
Best, Adam.