Laravel Pusher not working on Hostinger

I've setup broadcasting as pusher and also provided the right app id, key, secret, and cluster. I made a new notification called AppointmentUpdatedNotification and it implements ShouldBroadcastNow interface and change some of its methods:

<?php

namespace App\Notifications;

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Broadcasting\ShouldBroadcastNow;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\BroadcastMessage;
use Illuminate\Notifications\Messages\MailMessage;
use Illuminate\Notifications\Notification;

class AppointmentUpdatedNotification extends Notification implements ShouldBroadcastNow
{
    use Queueable;
    public string $user_id;
    public string $patient_id;
    public string $appointment_id;
    public string $doctor_id;

    /**
     * Create a new notification instance.
     */
    public function __construct(
        string $user_id,
        string $patient_id,
        string $appointment_id,
        string $doctor_id
    )
    {
        $this->user_id = $user_id;
        $this->patient_id = $patient_id;
        $this->appointment_id = $appointment_id;
        $this->doctor_id = $doctor_id;
    }

    /**
     * Get the notification's delivery channels.
     *
     * @return array<int, string>
     */
    public function via(object $notifiable): array
    {
        return ['broadcast'];
    }

    /**
     * Get the mail representation of the notification.
     */
    public function toMail(object $notifiable): MailMessage
    {
        return (new MailMessage)
                    ->line('The introduction to the notification.')
                    ->action('Notification Action', url('/'))
                    ->line('Thank you for using our application!');
    }

    /**
     * Get the broadcast representation of the notification.
     *
     * @param object $notifiable
     * @return BroadcastMessage
     */
    public function toBroadcast(object $notifiable): BroadcastMessage
    {
        return new BroadcastMessage([
            'user' => $this->user_id,
            'patient' => $this->patient_id,
            'appointment' => $this->appointment_id,
            'doctor' => $this->doctor_id,
        ]);
    }

    /**
     * Get the array representation of the notification.
     *
     * @return array<string, mixed>
     */
    public function toArray(object $notifiable): array
    {
        return [
            //
        ];
    }
}

And in livewire at the patient side I notify the doctor through this method:

protected function sendAppointmentUpdateNotification($appointment_id, $doctor_id): void
    {
        // Sends a new appointment notification to the doctor
        Doctor::firstWhere('id', $doctor_id)
            ->user
            ->notify(new AppointmentUpdatedNotification(
                auth()->user()->id,
                auth()->user()->patient->id,
                $appointment_id,
                $doctor_id
            ));
    }

And at the doctor's side which also uses livewire, I refresh through making the render method listen to the notification using Livewire\Attributes\On:

#[On('echo-private:users.{auth_user_id},.Illuminate\Notifications\Events\BroadcastNotificationCreated')]
public function render()

It works on localhost but when I deploy it on hostinger pusher just doesnt work and I cant see any connection made in debug console of pusher.