---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/322403#article
headline: "322403: Bad Request"
url: https://www.twilio.com/docs/api/errors/322403
inLanguage: en
dateModified: 2026-06-09T11:00:42.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 322403: Bad Request

Log Type: APPLICATION

Log Level: ERROR

## Description

Twilio returns this error when the OAuth Token API receives a malformed token generation request and cannot issue an access token. Send a `POST` request to the OAuth token endpoint with an `application/x-www-form-urlencoded` body that includes `client_id`, `client_secret`, and `grant_type=client_credentials`.

### Possible causes

* The request body was sent in a format the token endpoint does not accept. The OAuth Token API requires `application/x-www-form-urlencoded`, and unsupported content types can cause request errors.
* The payload was malformed, so Twilio could not process the token generation request. This error usually points to the overall request format or structure. Twilio surfaces separate errors for invalid credentials, empty `client_id`, empty `client_secret`, and invalid `grant_type`.
* The required form fields were not sent using the documented parameter names and values expected by the token endpoint.

### Possible solutions

* Rebuild the request to match the OAuth Token API requirements. Use `POST` and set `Content-Type` to `application/x-www-form-urlencoded`.
* Include the required form fields exactly as documented: `client_id`, `client_secret`, and `grant_type=client_credentials`.
* If you are building the request manually, send form-encoded fields such as `--data-urlencode` parameters instead of a JSON body.
* Verify that you are using the Client ID and Client Secret from a Twilio OAuth app, then retry the request after correcting the payload format.

#### Additional resources

* [OAuth Token API](/docs/iam/oauth-apps/oauth-access-token)
* [OAuth apps](/docs/iam/oauth-apps/overview)
* [Twilio API requests](/docs/usage/requests-to-twilio)