@Tarek Maximus Hello! I'm glad to hear you were able to get the HTTP request to pass. Let's troubleshoot the issues you're facing with VAPI. A 400 error typically indicates a bad request, which means there might be something incorrect or missing in the data you're sending to VAPI. Here are a few steps you can take to resolve this: 1. **Check the Assistant ID**: Ensure that the Assistant ID you've added is correct and corresponds to the one provided by VAPI. 2. **Review the Request Format**: Make sure that the request you're sending matches the expected format in the VAPI documentation. This includes the correct headers, body format, and any required parameters. 3. **Validate the Endpoint**: Confirm that the endpoint URL you've set up on your server is correct and capable of handling requests from VAPI. 4. **Examine the Scenario**: If you're running a scenario, ensure that all the steps are correctly defined and that any required data is being passed through. 5. **Server Logs**: Check your server logs to see if there's more detailed information about why the request is being rejected. 6. **VAPI Dashboard**: Review any logs or error messages in the VAPI Dashboard that might give you more insight into the problem. If you've already tried all of these steps and are still encountering issues, it might be helpful to provide more specific details about the request you're making and the exact error message you're receiving. This will allow for a more targeted approach to solving the problem. Remember, if you're stuck and need more direct assistance, you can always reach out to VAPI support for more detailed help.