A significant drop in the 'Sent' count for a recurring campaign, especially affecting one platform (like iOS), often points to an issue with the push certificate or configuration for that platform.
Common causes include:
- Expired Push Certificate: If the push certificate (e.g., APNs certificate for iOS) expires, the gateway will reject attempts to send notifications, drastically reducing your 'Sent' count for that platform.
- Incorrect Certificate Update: If a new certificate is uploaded incorrectly (e.g., mismatch between the certificate's App ID/topic and the app's configuration), it can lead to errors like 'Device Token Not For Topic'. This error means the device tokens you are trying to use are not valid for the currently configured certificate, effectively preventing sends to those devices.
Check your application's configuration in Pushwoosh, specifically the validity and settings of your push certificates (especially for iOS APNs). Ensure the certificate matches your app's Bundle ID and environment (Sandbox or Production).
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