# Troubleshooting

- [How to fix the "Unregistered" push test error?](/developer/troubleshooting/how-to-fix-the-unregistered-push-test-error.md): In some cases, Batch will fail sending a send test to your device. This happens when the token you are targeting is not valid anymore.
- [Why is my device not receiving push notifications on Android?](/developer/troubleshooting/why-is-my-device-not-receiving-push-notifications-on-android.md): Several issues may prevent your device or the device of someone in your team from receiving notifications on Android.
- [Why am I receiving my push notifications twice on Android?](/developer/troubleshooting/why-am-i-receiving-my-push-notifications-twice-on-android.md): Sometimes after you set up Batch's SDK, you receive push notifications twice due to misconfiguration.
- [My APNS push certificate expired, what should I do?](/developer/troubleshooting/my-apns-push-certificate-expired-what-should-i-do.md): Batch servers need a valid certificate to communicate with Apple Push Notification Services. Follow that guide to create a new one.
- [How to prevent Firebase from intercepting Batch push notifications?](/developer/troubleshooting/how-to-prevent-firebase-from-intercepting-batch-push-notifications.md): Firebase may intercept notifications on iOS. This can cause issues with Batch's handling of notifications (landings, deeplinks, and more).
- [How to fix issues with deeplinks in push notifications?](/developer/troubleshooting/how-to-fix-issues-with-deeplinks-in-push-notifications.md): Here are some suggestions if your deeplink is not working properly.
- [My mobile landing does not show](/developer/troubleshooting/my-mobile-landing-does-not-show.md): Mobile Landings may fail to display in certain cases. This guide outlines the most common causes and how to fix them.
- [Why is my device not receiving push notifications on iOS?](/developer/troubleshooting/why-is-my-device-not-receiving-push-notifications-on-ios.md): Several issues may prevent your device or the device of someone in your team from receiving notifications on iOS.
- [How to reach devices with Android 7.1.1 and lower versions?](/developer/troubleshooting/how-to-reach-devices-with-android-7.1.1-and-lower-versions.md)
- [What certificate authority does Batch use for its APIs and Dashboard?](/developer/troubleshooting/what-certificate-authority-does-batch-use-for-its-apis-and-dashboard.md)