---
page_type: error
code: 31202
message: "31202: Signature validation failed."
level: ERROR
product: Programmable Voice
---

## Description

The provided access token failed signature validation.

### Possible Causes

The access token has an invalid Account SID, API Key, or API Key Secret.

### Possible Solutions

Ensure the Account SID, API Key, and API Key Secret are valid when generating your access token.