Laravel Firebase Not Sending Push

Hello, I am working on a project where I have to send notifications to registered devices, I have written a complete code for that but firebase not sending push notifications to any device i.e android neither IOS. I am attaching my code please have a look at it.

if(!$device_tokens->isEmpty()){
   return sendPushNotification($device_tokens, "Confirmation alert", "Have you got the room?",1);                 
  }

 
   function sendPushNotification($registration_ids,$title, $message, $id=NULL)
{

    $header = [
        'authorization:key' . env('FCM_KEY'),
        'content-type: application/json'
    ]; 

    $url = env('FCM_URL'); 


    $post_data = '{
        "registration_ids" : "' . $registration_ids . '",
        "data" : {
          "title" : "' . $title . '",
          "description" : "' . $message . '",
          "id" : "' . $id . '",
          "text" : "' . $message . '",
        },
        "notification" : {
            "body" : "' . $message . '",
            "title" : "' . $title . '",
            "description" : "' . $message . '",
            "sound" : "default"
            }

      }';

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);

    $result = curl_exec($ch); 
    if ($result === false) {
        $result_noti = 0;
    } else {
 
        $result_noti = 1;
    }   
    return $result_noti;
    //curl_close($ch);

}

I have checked the device token variable and it contains device tokens that have to be sent in the form: ['deivcetoken1','devicetoken2']. I also dd server key and URL and they are also fine, Even curl request returns true response but push notification still not received on the android/ios device.

P.S: My FCM_URL is:https://fcm.googleapis.com/fcm/send and Firebase server key is stored in env file as FCM_KEY, Thanks.