​ To learn more, see the sources I considered: [[1] URGENT help needed with the API (create-phone-call)](https://discord.com/channels/1186424376300679209/1446501582744191027) [[2] Hi ,](https://discord.com/channels/1186424376300679209/1397614768440742012) [[3] 404 Error on Create a Phone Call](https://retell.discourse.group/t/404-error-on-create-a-phone-call/22) ​

### Answer I don't see the actual error message in your message—could you share the specific error you're seeing? That said, based on similar issues others have encountered when using automation platforms (like Make.com) with Retell AI's create-phone-call endpoint, here are the most common causes and solutions: If you're getting a 404 error: 1. Phone number not connected correctly — Verify your phone number is properly configured in your Retell AI dashboard. Even if it shows in the dashboard, it may not be connected correctly. [(1) ]() , [(2) ]() 2. Check for extra whitespace — Remove the phone number and reconnect it, ensuring there are no extra spaces in the number. [(1) ]() 3. Verify API key — Double-check that your API key is correct. [(2) ]() 4. Phone number must be purchased/configured through Retell AI — Your

from_number

must be a number you've purchased and configured through Retell AI or properly imported from a supported provider (Twilio, Telnyx, etc.) . [(3) ]() 5. Correct payload structure — Ensure you're using the correct parameter names like

override_agent_id

instead of

agent_id

, and

retell_llm_dynamic_variables

instead of

custom_data

. Quick test: Try making a call directly from the Retell AI dashboard/playground first. If that works but Pabbly doesn't, the issue is likely in your Pabbly configuration. [(1) ]() Please share the specific error message you're seeing so I can help narrow down the issue f

urther.

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.