---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/80625#article
headline: "80625: Unauthorized Request. Signature is missing or is invalid"
url: https://www.twilio.com/docs/api/errors/80625
inLanguage: en
dateModified: 2026-03-11T22:03:37.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 80625: Unauthorized Request. Signature is missing or is invalid

Log Type: APPLICATION

Log Level: ERROR

## Description

A valid signature header needs to be provided for the request to be authenticated.

### Possible causes

Header - 'X-Twilio-Signature' is missing or is invalid

### Possible solutions

Provide a valid signature value in header 'X-Twilio-Signature'