Error APNS device token not set before retrieving FCM Token for Sender ID

Question

I am receiving messages from firebase for notifications with APNs. In firebase, I have the certificate of APNs key, with the same id in the Xcode project in Firebase that is extracted from Apple Developer.

But I don't know why this could be happening and I get this error and it is registering two tokens in the Messaging extension:

extension AppDelegate : MessagingDelegate {
  func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String?) {}}

APNS device token not set before retrieving FCM Token for Sender ID '########'. Notifications to this FCM Token will not be delivered over APNS.Be sure to re-retrieve the FCM token once the APNS device token is set.

Added what I have in the AppDelegate

import Firebase
import MasivPushIosSdk

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate{

    var firebaseToken: String = ""
    
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        FirebaseApp.configure()
        self.registerForFirebaseNotification(application: application)
        Messaging.messaging().delegate = self
        return true
    }
    
    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        Messaging.messaging().apnsToken = deviceToken
    }

    func registerForFirebaseNotification(application: UIApplication) {
        if #available(iOS 10.0, *) {
            // For iOS 10 display notification (sent via APNS)
            UNUserNotificationCenter.current().delegate = self

            let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
            UNUserNotificationCenter.current().requestAuthorization(
                options: authOptions,
                completionHandler: {_, _ in })
        } else {
            let settings: UIUserNotificationSettings =
                UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
            application.registerUserNotificationSettings(settings)
        }

        application.registerForRemoteNotifications()
    }
    
}

extension AppDelegate: MessagingDelegate, UNUserNotificationCenterDelegate {

//MessagingDelegate
    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String?) {
        self.firebaseToken = fcmToken!
        print("Firebase token: \(fcmToken)")
    }

    //UNUserNotificationCenterDelegate
    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        print("APNs received with: \(userInfo)")
     }
}

Answer 1

This might be late, but the error

APNS device token not set before retrieving FCM Token for Sender ID '########'. Notifications to this FCM Token will not be delivered over APNS.Be sure to re-retrieve the FCM token once the APNS device token is set.

was sorted for me by adding this

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        print("Yay! Got a device token 🥳 \(deviceToken)")
        Messaging.messaging().setAPNSToken(deviceToken, type: .unknown)
    }