# 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.