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Android devices and Chrome browsers receive push notifications through a technology called Firebase Cloud Messaging (FCM). FCM expires tokens for devices that have been inactive for more than 270 days. These devices may be lost, destroyed, or put into storage and forgotten and are considered no longer reachable. This is a cleanup exercise from Google–your expected clicks and sessions and the value you get from OneSignal will not change. In addition, you may see some benefits, including:
  • More accurate analytics: your CTR will more accurately reflect your reachable audience and the level of engagement
  • Faster delivery: removing inactive devices results in smaller audiences, and the campaign finishes delivering faster
  • Less manual work: save on time previously spent managing inactive audiences

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FAQ

Starting May 15, 2024, FCM is expiring tokens for devices that have been inactive for more than 270 days. When the changes roll out to your app, the next time you send a push notification to those inactive devices, their push subscriptions will be unsubscribed, and you will see an increase in unsubscribe counts reflected in your OneSignal dashboard and delivery reports.
After FCM expires the push token, the token will not be valid again. The device will be unsubscribed, but it will continue to exist in OneSignal with the associated data until you choose to delete it. However, that particular token will never be reachable again.
FCM is measuring inactivity on the device level, not on the individual Firebase project level. This means that even if the device hasn’t interacted with your app in the past 270 days, the device could still be active and therefore wouldn’t be deleted. You won’t be able to tell if the device is inactive until you try to send a notification and then see it unsubscribed.
When the device comes back online, the user will have to open your application again, and the OneSignal SDK will automatically get a new push token that will update on the existing subscription record. The user will keep their subscribed status for push notifications and will not have to opt-in to push again as push permissions are stored on the device side for a given app.
Unfortunately, FCM does not differentiate between the types of unsubscribes, so you will not be able to differentiate.
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