I’m trying to trigger outbound calls from Make.com using the /call API endpoint, but I keep getting 400 Bad Request errors — even after testing the recommended formats and verifying my assistant ID, Twilio SID, token, and number.

I need to confirm:

If API access is fully enabled for my account

If the /call endpoint is available to my API key

Whether I need to be on a specific plan or have additional permissions to trigger outbound calls using my own Twilio number