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.
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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