---
title: "Discussion on \"FCM UNREGISTERED Error: Requested Entity Was Not Found, and How to Fix It\" | Hashnode"
description: "Discussion on \"FCM UNREGISTERED Error: Requested Entity Was Not Found, and How to Fix It\". FCM 404 UNREGISTERED means the device token no longer works. Why it happens, how to clean up tokens, and when it's a different error."
url: "https://hashnode.com/posts/fcm-unregistered-error-requested-entity-was-not-found-and-how-to-fix-it/6aeeb68a36508ac8f8003281"
---

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# [FCM UNREGISTERED Error: Requested Entity Was Not Found, and How to Fix It](https://notifysphere.hashnode.dev/fcm-unregistered-error-requested-entity-was-not-found-and-how-to-fix-it?utm_source=hashnode&utm_medium=feed)

FCM 404 UNREGISTERED means the device token no longer works. Why it happens, how to clean up tokens, and when it's a different error.

4d ago · 6 min read · notifysphere.hashnode.dev  
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-   [#firebase](https://hashnode.com/tag/firebase)
-   [#push-notifications](https://hashnode.com/tag/push-notifications)
-   [#android](https://hashnode.com/tag/android)

## Written by

[Sandeep Joshi](https://hashnode.com/@notifysphere)

@notifysphere · Kota, Rajasthan, India

  
[View profile](https://hashnode.com/@notifysphere)

Mobile app developer, 12+ years. CTO of notifySphere: push, WhatsApp API and deep linking in one SDK.

Mobile app developer with 12+ years of experience, building notifySphere from Kota, India: push notifications, WhatsApp Business API and deep linking in one SDK for React Native and Flutter. I write practical guides on fixing mobile messaging problems. https://notifysphere.net

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