i cant update anything in start speaking plan

The error suggests your

transcriptionEndpointingPlan

is undefined when updating the start speaking plan. Try making a PATCH request to update your assistant with a properly structured JSON payload:

json
{
  "startSpeakingPlan": {
    "waitSeconds": 0.4,
    "transcriptionEndpointingPlan": {
      "onPunctuationSeconds": 0.1,
      "onNoPunctuationSeconds": 1.5,
      "onNumberSeconds": 0.5
    }
  }
}

Make sure your content-type header is set to "application/json" in the request. Source: - [Vapi Speech Configuration](https://docs.vapi.ai/customization/speech-configuration)

You can’t update the Start Speaking Plan via the Vapi dashboard, only through the API using the speechConfig settings in the assistant update endpoint.