---
page_type: error
code: 52109
message: "52109: GCM/FCM unauthorized error"
level: ERROR
product: Notifications
---

## Error - 52109

### GCM/FCM unauthorized error

#### 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.