[Streaming API] Send task return 100 but 0ms of playback

I'm using Streaming API to generate WebRTC Video, the avatar is loaded successfully, i can see the animation while waiting for input. when i send task it returns 100 but 0ms video playback duration, any idea why and how to fix this?

Task sent: {"code":100,"data":{"duration_ms":0,"task_id":"5e258079-4f14-11ef-810d-06ca4cf198b5"},"message":"success"}