iOS Live Activity pushToken Retrieval Failure

Problem Description

We are encountering a pushToken retrieval failure when creating Live Activities using the ActivityKit framework in our iOS application.

Problem Symptoms

• Failure Rate: Approximately 40% of Live Activities created in production fail to obtain a pushToken
• Behavior: The Activity is created successfully, but activity.pushToken and the activity.pushTokenUpdates stream remain empty / return nothing
• Impact: Unable to update Live Activities via APNS

Offline Issue Environment

• iOS Version: iOS 26.5
• Device: Physical iPhone device
• Deployment Environment: Production environment, release build

Code Sample

Task {
    // Executed after Live Activity creation
    for await activity in Activity<T>.activityUpdates {
        ...
        if let activityTokenData = activity.pushToken {
            // Report token to APNS service
            reportTokenToAPNS(tokenString)
        }
        // Start async monitoring
        self.registerPushTokenUpdates(...)

        Log("actObserver: Live Activity registered successfully")
    }
}

// Async monitoring
private func registerPushTokenUpdates<T: SAKActivityAttributes>(...) {
    Task {
        self.pushTokenObserveRecords.safe{ $0.append(activity.id) }
        Log("Monitoring pushToken updates for Live Activity <\(activity.id)>")
        for await data in activity.pushTokenUpdates {
            let pushToken = pushTokenString(with: data)
            // Report token to APNS service
            reportTokenToAPNS(pushToken)
        }
    }
}

System Log Evidence

System logs, log and log