Confirmed delivery

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Overview

Confirmed Deliveries Flow

• Apple Push Notification Services (APNs) for iOS and Safari
• Google Firebase Cloud Messaging (FCM) for Android and Chrome
• Huawei Messaging Service (HMS) for Huawei devices
• Amazon Device Messaging (ADM) for Amazon devices
• Microsoft Push Notification Service (MPNS) for Windows devices

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Requirements

• Confirmed Delivery is only available on paid plans. Compare plans and pricing.
• Complete all steps in our Mobile SDK Setup, especially the iOS Notification Service Extension and App Group setup.
• The push Subscription must have our device-side SDK installed (cannot be an API-created subscription).

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Platform-specific limitations

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iOS

• Requires both the Notification Service Extension (NSE) and correct App Group configuration to confirm receipt. Make sure to follow our Mobile SDK Setup guide for directions on setup and testing.
• APNs keeps only 1 message per app if device is offline. If the iOS device is offline and 2 or more push is sent to it, only the last push will be received.

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Huawei

• Only available for data Huawei message type. However, Huawei provides the confirmed delivery data for the message type directly in their dashboard.

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Web

• Safari is not supported.

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Handling inactive devices

• Use Audience Activity to try resending messages to users who “Did not Confirm Delivery.”
• Create Segments based on Last Session to identify users inactive for 6 months, 1 year, or longer.
• Periodically target inactive users with push notifications to identify unsubscribed or unreachable devices.

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FAQ

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Why are my confirmed delivery numbers low or not showing?

1. You may have a lot of inactive/older subscriptions. See above Handling inactive devices for more details.
2. You may have platform-specific limitations if using Huawei or Safari.
3. There may be a setup issue. This is most common with iOS but can happen with other platforms. See Troubleshooting Confirmed Delivery for more details.

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Why does it say confirmed but not shown on my device?

• The push is overlooked by mistake.
  • Especially common on iPhones with Focus modes enabled like “Do not disturb”, “Sleep”, or a custom setup. Push notifications received outside of this state are grouped differently than those received while in this state. All push notifications received while in a Focus mode are grouped together until the Focus mode is over. At which point, the push notifications will re-group with others for the app. If you swiped away all the grouped notifications while in Focus mode, you may miss them.
• You may have custom code in your app suppressing notification display. Check for the following code in your app:
  • event.preventDefault();
    • This can be found in the foreground lifecycle listener and Notification Service Extension. When used, it will block the push from being displayed while the app is open.
  • If you are using other push services or native APIs that can remove push like:
    • func removeDeliveredNotifications(withIdentifiers: [String])
    • func removeAllDeliveredNotifications()
• Check the push payload or data you are sending with the push notification.
  • Make sure you send with high priority
  • If using the collapse_id parameter, this will replace the older push with newer ones using the same collapse_id.
• Are you sending to the correct device?
  • You may be sending to the wrong device by mistake. See Find and set Test subscriptions to find your subscription.

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Troubleshooting Confirmed Delivery

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General scenarios

• Device offline: Push can be delivered up to 3 days later by default if the device is offline. Adjust this using the Time To Live parameter.
• Unstable network: The notification may be received and/or clicked but the confirmation might fail to send due to network issues or app crash. This should be rare.

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iOS troubleshooting

• NSE properly configured following our Mobile SDK Setup guide.
• The same App Group name for both the main app and the NSE.
  • ✅ group.your-main-app-target-bundle-id.onesignal
  • ❌ group.your-bundle-id.OneSignalNotificationServiceExtension.onesignal
• Message is sent with mutable-content set to 1. This happens automatically, but you may be setting it to 0 in your code.

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Android troubleshooting

• If notifications are not displaying on Android, see our Notification Not Shown Guide.
• If notifications display, but no Confirmed Delivery reported, you likely have a custom Android Notification Service Extension blocking the request. See our Android Service Extension setup guide to make sure you implemented it to work correctly with OneSignal Notifications.

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Web troubleshooting

• Due to limitations with the Safari browser, it cannot support Confirmed Delivery.
• Ensure that you migrated to the v16 SDK correctly. See our User Model Web Migration Guide for more details.
  • Your init code loads the correct v16 SDK:
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    <script src="https://cdn.onesignal.com/sdks/web/v16/OneSignalSDK.page.js" defer></script>
    

  • Your OneSignalSDKWorker.js Service Worker script references the correct v16 script:
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    importScripts("https://cdn.onesignal.com/sdks/web/v16/OneSignalSDK.sw.js");