Issue
We're encountering the "Device Token Not For Topic" error.
Now we cannot receive the push notification on our devices and the amount of our iOS devices has decreased.
Troubleshooting
Issue Overview
The DeviceTokenNotForTopic
error occurs when Apple Push Notification service (APNs) identifies a mismatch between the push notification token and the app’s topic (usually the App ID). This mismatch prevents notifications from being delivered to devices.
Typically, this happens when:
- The token issued to a device is linked to one Apple App ID, but the push SSL certificate on the server is configured for a different App ID.
- The APNs service attempts to send a push notification, but the topic (App ID) doesn't match the token on the device, triggering the error.
Step-by-Step Troubleshooting
Step 1: Check Apple App ID Consistency
-
Verify the Apple App ID: Ensure that the Apple App ID in your provisioning profile (used to deploy the app) matches the Apple App ID configured for the push SSL certificate on your server. The App ID must be consistent across both the app and server to avoid topic mismatches.
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Double-check Certificate Generation: Confirm that the SSL certificate used for sending push notifications was generated using the same Apple Developer account that matches your App ID. A mismatch in accounts can lead to this error.
Step 2: Correct the Certificate Issue
-
If you find a mismatch in the Apple App ID or certificate, re-generate the push SSL certificate using the correct Apple Developer account. This ensures that APNs can correctly link the notification tokens with your app’s topic.
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Once the correct SSL certificate is in place, your push notifications should start working again, and the number of active iOS devices receiving notifications will gradually recover.
Step 3: Reconfigure iOS platform (if necessary)
If you no longer have access to the Apple Developer account that was originally used to generate the certificate, follow these steps:
-
Reconfigure your iOS push notification settings from scratch using the correct Apple Developer account.
-
For detailed guidance on reconfiguring your iOS platform, refer to the Pushwoosh documentation:
Pushwoosh iOS SDK Setup Guide
By following these steps, you can resolve the DeviceTokenNotForTopic
error and restore push notification functionality for your iOS devices.
See also:
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