First, confirm avatar.start(...) completed without raising an exception. Check that the avatar is starting in the same LiveKit room as your agent, and that LIVEKIT_URL, LiveKit credentials, and your Protoface API key are valid.
Also confirm the avatar is ready, note the avatar.session_id, and check the session status for failures. If it works in the dashboard or playground, the issue is likely in your LiveKit or agent setup.