# How to fix the "Unregistered" push test error?

In some cases, the dashboard may show an error when you try sending a test notification to your iOS or Android device, or to your web browser: "Push test has failed NotRegistered".

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This usually happens because the device token is not valid anymore. Each time you reinstall your app, Apple or Google resets your existing token and generates a new one for your device, invalidating the existing one.

To fix the issue, you need to **find the Installation ID attached to your new push token**: [iOS](https://doc.batch.com/developer/technical-guides/how-to-guides/how-to-find-my-installation-id-on-an-ios-device) / [Android](https://doc.batch.com/developer/technical-guides/how-to-guides/how-to-find-my-installation-id-on-an-android-device) / [Web](https://doc.batch.com/guides-and-best-practices/message/push-notifications/how-to-send-a-test-push-notification-to-your-web-browser#h_17fa92f09d).