# 52118: FCM Bad Request

Log Type: APPLICATION

Log Level: ERROR

## Description

### Possible causes

* Invalid or missing registration token.
* Incorrectly formatted JSON payload.
* Invalid or missing required fields in the request.
* Exceeding the payload size limit.
* Invalid API key or authentication token.

### Possible solutions

* Verify that the registration token is correct and not expired.
* Ensure the JSON payload is correctly formatted and adheres to FCM specifications.
* Check that all required fields are included and correctly populated in the request.
* Ensure the payload size does not exceed the maximum limit allowed by FCM.
* Verify the API key or authentication token is valid and has the necessary permissions.