---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/52109#article
headline: "52109: GCM/FCM unauthorized error"
url: https://www.twilio.com/docs/api/errors/52109
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 52109: GCM/FCM unauthorized error

Log Level: ERROR

## Description

### Possible causes

* ApiKey/Secret is revoked or invalid.

### Possible solutions

Provide a new API Key/Secret and make sure your application is configured to use it.

* If using IP-Messaging, update your Credential with the new API Key/Secret.
* If using User Notifications, you can either update your Credential or create a new Credential and update your Service's GcmCredentialSid/FcmCredentialSid.