Hey Vapi team — I’m trying to start a call using the /call endpoint from n8n, and I keep hitting this error: 400 - "Couldn't Get Assistant. Need Either

assistant

,

assistantId

,

squad

, Or

squadId

." Here’s what I’ve tried so far: Passed assistantId: Also tried using "assistant": "Kylie" by name Tried both a Twilio number (with SID and auth token) and the Vapi shared number using phoneNumberId: Using n8n’s HTTP Request node to send the request Set the Authorization header with both Private API Key and Public API Key Also tried authenticating with a JWT (including orgId, token, and exp) in the Authorization header Still getting the same error on every attempt I’m currently on the trial plan Can someone confirm if trial assistants need to be saved, assigned to a squad, or have special permissions to be used via backend API? Appreciate any help — I’ve been troubleshooting every angle. Thanks

Thanks for the detailed info! To help troubleshoot, could you confirm whether the

assistantId

you are passing in your API request matches exactly with an assistant listed in your Vapi dashboard (under Assistants), and that this assistant is not deleted or in draft state? Source: - [API Reference List Assistants](https://docs.vapi.ai/api-reference/assistants/list)

Yes it is the same ID and it says the assistant is published

cc: @Kings_big💫

Include a valid assistantId or assistant as a full object, not just the name in your /call request payload. Alternatively, use a squad or squadId if routing through multiple assistants. Make sure the assistant is saved in your Vapi dashboard, and use your Private API Key in the Authorization header..