When an app is uninstalled, you might expect FCM to instantly report the token as Unregistered. However, similar to APNs, FCM does not always report token invalidation immediately.
Google does not publish an exact invalidation schedule for FCM, but the delay is a commonly reported behavior, ranging from hours to several days after uninstall. Therefore, invalid tokens may remain in your database slightly longer than expected until FCM officially confirms their Unregistered status during a subsequent push attempt.
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