52118: FCM Bad Request

FCM Bad Request

• 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.

• 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.