iOS Firebase Notifications Not Received on Fresh Installs Until Re-login

I'm encountering an issue with push notifications on iOS devices. Firebase Notification configuration is set up correctly, and test notifications from the Firebase Console are working. However, when sending notifications from the backend, freshly installed apps are not receiving the notifications.

After terminating the app, if I log out and then re-login, notifications sent from the backend work fine.

My current device registration for token is as follows:

SWIFTCopied
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    Messaging.messaging().apnsToken = deviceToken
    deviceTokenString = deviceToken.reduce("") { $0 + String(format: "%02X", $1) }
    fcmTokenString = Messaging.messaging().fcmToken ?? ""

    print("deviceTokenString \(deviceTokenString)")
    print("fcmToken \(Messaging.messaging().fcmToken ?? "")")

    UIViewController().deviceToken = deviceTokenString //This will be stored in UserDefault
    UIViewController().fcmToken = fcmTokenString //This will be stored in UserDefault
}

Firebase Console (Messaging):

Notification received on device:

Below is the Laravel backend code used to send the notification:

PHPCopied
$url = 'https://fcm.googleapis.com/fcm/send';
$FcmToken = User::whereNotNull('fcm_token')->pluck('fcm_token')->all();
// echo "<pre>"; print_r($FcmToken); die;
// $sendusersids = User::whereIn('id', $users_ids)->whereNotNull('fcm_token')->pluck('id')->all();

foreach ($FcmToken as $key => $FcmTokenone) {

    $fcmService = new FCMService();
    // dd($fcmService);

    // $deviceToken = 'eAzUspsvcEvIjjZ0NVuwBp:APA91bHLgRtV-Oa3xl3HbalmZuhbaslU_IO8HnPi15OL8AabK6aSPF-lo7AC1GcA4BL_YW1osBpMXvuc4nXWtOySqjDQDp1tpGcyzwc8QoTd5Ay3_iayoAw';  // Token for the device you want to notify
    // $deviceToken = 'fbb-W4NZQni5DUkk6fgnPy:APA91bGBUCFueEuUZnad-0jKWusKQoygeQtrvGz6BwfSgBv6RLfJh3U-beEXeIp_S36j4xc5NOsFIexSG4xiM4i3iKBGMb3qnbg-NPB6VgjWfuwM6XnAtW8';  // peterson fcm token

    $title = 'GLO Mini Golf Promo code';
    $body = $data['description'];

    $data1 = [
        // "registration_ids" => [$deviceToken],
        // "registration_ids" => [$FcmTokenone[0]],
        "registration_ids" => [$FcmTokenone],
        "notification" => [
            "title" => $title,
            "body" => $body,
        ],
        "data" => [
            "type" => 'group',
            "id" => 123,
        ]
    ];

    $response = $fcmService->sendNotification($data1);
    Log::error("pushnotificaiotn-->".".$response");

    $this->client = new Client();
    $this->serverKey = env('FIREBASE_SERVER_KEY'); // Server key from Firebase credentials
    $this->projectId = env('FIREBASE_PROJECT_ID'); // Firebase project ID

    public function sendNotification($notification_data) {
        $access_token = self::getAccessToken();

        $device_token = $notification_data['registration_ids'][0];
        $title = $notification_data['notification']['title'];
        $body = $notification_data['notification']['body'];
        $type = $notification_data['data']['type'];
        $id = $notification_data['data']['id'];

        $message = array(
            'token' => $device_token,
            'notification' => [
                "title" => $title,
                "body" => $body,
            ],
            'data' => [
                "type" => (string)$type,
                "id" => (string)$id
            ],
        );

        Log::error("notification_message--->".json_encode($message));

        $arrayToSend = array('message' => $message);

        $curl = curl_init();
        curl_setopt_array($curl, array(
            CURLOPT_URL => "https://fcm.googleapis.com/v1/projects/" . "]$this->projectId"/messages:send",
            CURLOPT_CUSTOMREQUEST => "POST",
            CURLOPT_POSTFIELDS => json_encode($arrayToSend),
            CURLOPT_HTTPHEADER => array(
                "authorization: Bearer " . "];$access_token",
                "cache-control: no-cache",
                "content-type: application/json"
            ),
        ));
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $response = curl_exec($curl);
        Log::error("notification_res-->".$response);
        if ($response === false) {
            $error = curl_error($curl);
            Log::error("sendNotification error".$error);
            curl_close($curl);
        }

        curl_close($curl);
        Log::error("sendNotification success " . $response);
        $responseData = json_decode($response, true);
        return true;
    }
}

Notification delivery status log:

[2025-01-23 12:26:40] production.ERROR: pushnotificaiotn-->1
[2025-01-23 12:26:40] production.INFO: Access Token Generated Successfully: {"access_token":"ya29.c.c0ASRK0GbNRMdPbCklv1jZ1uBkgD-Y5an_0WW3GIXYQisl3daLuFO4i0_fxAdpVu8RxKCNSJZ-HUQJFu1au3C618-NkZsB0yd8OdO_-wLVXwyrPJ782c-uPhkhvOI4DceC7qvBfQjo7SIb9I6BQ2C06ZSpnBrNJvhGL_dly6t4ufYCwknPawDuGRyHD5pOb_jVsaxEqAs5ZxEMJEPMoGnZowWMHxosKtwHB-ofno_P6TYQUMYL9iKF4nr8H6XYjrGX8EQl0JrduwpS4hXn_rCCY05y4zdTO_GGAb_Dii88qhxGmwLo0MJfuMnHUJrrGBtd2UPys6K5DPcsFs9Bhb2N8w1u2PT7XAIk1NFsLYSiyZ7B2ozySW8B30NmE385AZ0UmIuy-k_psZrjcR1zYh0IFyFBy3Va3_nfUStWI0Ou9Q-8knZiMVUyhjM787tcyFavFO5hUV9ux4appgi45kwua-t8S1uOJjrlj1R23lpU8IeXaOmdoug6o2c1hbIM94aO_cnh7VcWszMp7OYn3Qvb72jhr0IV1M0RQwy2hvb67zJuIVyRk1e2Fh-Wj3yQfmer02YyRxj7rSXJo2Q2MIioQYVfO6ym4ixczddkuvYliocptSrYdcskyQYV6Jv7ZW2tw8wMI0nJ9v0gSJdktpwYr219Mmwt1pwp6WZ37tpJYQkUB9mrO2furu0Vqyam59M-nfloxMeInhOo9-8a80poFrQupYIk665ntwWBdVs4td0JQWF1FVnvsQqM9Z7emsF075ecag9xXJ2is3Q_M58OdgzFjqioXVI5aBZvd-x81nsJz7zMp3Za0B0kZYIsbl7-xdtt-OweQsntoh65oa_O-Xnhpfpku8xidZ5V642foF9rvzj16hQxxk4V2aO1Qpj5g1eYt2j_g_kJtgBYWoOjaIIewXspg_goIMz4xz28jcMV88cv_I3-w9bj0w705vtxyiSrORp7ZpUyOfWiFqja4tVtjV4Qmzy3zv5tWxpRz6Op2xljnI8VyX9","expires_in":3599,"token_type":"Bearer","created":1737635200}
[2025-01-23 12:26:40] production.ERROR: notification_message--->{"token":"csQwYhf3FUnvuyLVhHCFEq:APA91bFIMKRtNOaRC0p_-Hgl6bgSg7C-lEQ7uBSUHBivNIH5lra8hnl92ZSm9lcfk9N4gpCwwP8w26s3iX0d121ehEr2S7-S7zbSBFgYNUOZaEDDszOUEtL_uHzIgbOykb85Au_zUcED","notification":{"title":"GLO Mini Golf Promo code","body":"test"},"data":{"type":"group","id":"123"}}
[2025-01-23 12:26:41] production.ERROR: notification_res--> {
"name": "projects/glo-mini-golf-1dac4/messages/1737635200881686"
}
[2025-01-23 12:26:41] production.ERROR: sendNotification success {
"name": "projects/glo-mini-golf-1dac4/messages/1737635200881686"
}

I suspect the issue is related to how the FCM token is fetched. Since the token may be generated asynchronously, using Messaging.messaging().fcmToken immediately in didRegisterForRemoteNotificationsWithDeviceToken could result in an empty or stale token on a fresh install. My goal is to have backend notifications delivered immediately after installation, without requiring the user to re-login.

Any insights on ensuring the correct FCM token is available for backend notifications on first install would be appreciated.