onError

Called when HMS push token retrieval fails.

This callback is executed on the main thread if token retrieval encounters an error. Common errors include missing agconnect-services.json configuration or HMS API failures.

Common error messages:

• "Missing client/app_id key in agconnect-services.json" - Configuration error
• "Status code: XXXX" - HMS API error (see Huawei documentation for error codes)
• "Context is null" - Application context not available

Parameters