ERROR: 20003 

The error 20003 – Authentication failed indicates that the system was unable to authenticate with Twilio. This typically occurs when the Twilio Account SID, Auth Token, or API credentials are incorrect, expired, or when the Twilio account has been suspended.

This error prevents SMS, MMS, or call-related requests from being processed successfully.

Possible Causes

1. Invalid Twilio Credentials

  • Incorrect Account SID

  • Incorrect Auth Token

  • Invalid or deleted API Key / Secret

  • Credentials copied with extra spaces or formatting errors

2. Twilio Account Suspension

  • Account suspended due to billing issues

  • Policy violations or compliance concerns

  • Trial account restrictions

  • Account manually closed or deactivated

Possible Solutions

  • Confirm that the Account SID and Auth Token entered are accurate.

  • Make sure you are accessing and using credentials from the correct Twilio account or subaccount.

  • Verify that the Twilio account is active and not suspended or closed.

  • Check that no additional spaces or unintended characters were included when copying and pasting the credentials.