swift - Silent push notifications not working on some iOS devices - Stack Overflow

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I send APNs notifications to my devices with the CloudKit dashboard. I test with two devices;

Device with Silent Push Working Successfully: iOS version 16.5.1 (c), Model iPhone Xs

Silent Push Failed Device: iOS version 15.3.1, Model iPhone Xr

Normal alert notifications work successfully on both devices. But I can't see any log in my project even though silent push is sent successfully on one device.

What I've Checked:

• content-available is set to 1.

• My app is not in kill state, it is in foreground or pending in the background.

• When I send simple notifications, I can see logs in my swift project and notifications on physical devices without any problem.

• No, my certificate has not expired and if there was a problem with it, I would not be able to see the normal notifications.

• My phone is not in power saving mode and the “Background App Refresh” option is turned on in the app's settings.

• Both devices in charging state.

• App capabilities: Background Modes is enabled with Remote Notifications, Background Fetch, Background Processing.

CloudKit Dashboard After Sending Silent Push:

My AppDelegate Class In Swift Project:

import SwiftUI
import UIKit
import UserNotifications

class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { granted, error in
            if granted {
                DispatchQueue.main.async {
                    UIApplication.shared.registerForRemoteNotifications()
                }
            }
        }
        return true
    }

    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let tokenParts = deviceToken.map { data in String(format: "%02.2hhx", data) }
        let token = tokenParts.joined()
        print("Device Token: \(token)")
    }

    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print("Failed to register: \(error)")
    }
    
    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        logInfo("Received Push Notification: \(userInfo)")

        if let aps = userInfo["aps"] as? [String: AnyObject], aps["content-available"] as? Int == 1 {
            logInfo("This is a silent push notification")
            //DO SOME WORK
            completionHandler(.newData)
        }

        completionHandler(.newData)
    }
}

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