---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/321405#article
headline: "321405: Empty client_secret"
url: https://www.twilio.com/docs/api/errors/321405
inLanguage: en
dateModified: 2026-06-09T11:00:42.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 321405: Empty client\_secret

Log Type: APPLICATION

Log Level: ERROR

## Description

Twilio returned this error because the Token API request did not include a value for `client_secret`. You must provide a valid `client_secret` when your request uses a confidential client that requires client authentication.

### Possible causes

* The request omitted the `client_secret` parameter.
* The request included `client_secret` with an empty value.
* Your application did not load the client secret from configuration before sending the request.
* A deployment or environment variable issue caused your application to send a blank `client_secret`.

### Possible solutions

* Include the `client_secret` parameter in your Token API request.
* Confirm that your application reads the correct client secret from your secure configuration or secret manager.
* Verify that your request body sends a non-empty value for `client_secret`.
* If you are using OAuth 2.0 client credentials managed in Twilio, review your client configuration in Twilio IAM and make sure you are using the correct secret.
* Regenerate the client secret if needed, then update your application to use the new value.

#### Additional resources

* [Twilio IAM documentation](/docs/iam)
* [API authentication and security](/docs/iam/api)