321402: Empty client_id

This error occurs when you call the OAuth Token API without a value for client_id. The Token API requires client_id, client_secret, and grant_type in an application/x-www-form-urlencoded POST request body, and client_id is the unique identifier of your OAuth app.

• You omitted client_id from the Token API request body.
• You sent client_id with an empty value. Twilio returns this condition as "Empty client_id," and the parameter is required.
• You did not send the request body as application/x-www-form-urlencoded, so Twilio could not read the required client_id parameter.

• Include client_id in the form-encoded request body and make sure the parameter name is exactly client_id.
• Open your OAuth app in Console and copy the Client ID generated for that app. Twilio creates the Client ID and Client Secret when you create an OAuth app.
• Send a complete token request to the OAuth token endpoint with client_id, client_secret, and grant_type=client_credentials.

• OAuth apps overview
• OAuth Token API
• Identity and Access Management