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LiveAvatar /v1/sessions/start returning 500 for valid FULL-mode persona (token succeeds, start fails)

I’m building a fullscreen Electron + React client that talks directly to the LiveAvatar API. I obtain a session token successfully via POST https://api.liveavatar.com/v1/sessions/token (mode FULL, with explicit avatar_id, context_id, voice_id, language). Immediately afterward, when the SDK calls POST https://api.liveavatar.com/v1/sessions/start using that token, the API responds with HTTP 500 “Internal server error”. Because /start never succeeds, follow-up calls to /v1/sessions/stop understandably return 404 “Session not found”.

Could you check why /v1/sessions/start is failing on your side for this persona / account combo? All IDs belong to the same workspace, and the API key should have Full Mode access. I can share the exact session_id from the /token response if needed; please let me know what additional data would help you trace the error.