Laravel Pusher Doesn't Join Private Channel

Hey, there. So I'm using Laravel 5.8, and I have this problem in which my Laravel Echo code doesn't trigger Pusher to join a private channel. When I switch things up to a public channel, everything seems to work fine. This is how my code looks like:

In App\Events\ProfileUpdated:

<?php

namespace App\Events;

use Illuminate\Queue\SerializesModels;
use Illuminate\Broadcasting\PrivateChannel;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;

class ProfileUpdated implements ShouldBroadcast
{
    use Dispatchable, InteractsWithSockets, SerializesModels;

    public $user;

    /**
     * Create a new event instance.
     *
     * @return void
     */
    public function __construct($user)
    {
        $this->user = $user;
    }

    /**
     * Get the channels the event should broadcast on.
     *
     * @return \Illuminate\Broadcasting\Channel|array
     */
    public function broadcastOn()
    {
        // return new PrivateChannel('Profile.' . $this->user->id);
        return new PrivateChannel('Profile');
    }
}

In routes\channels.php:

<?php

// Criteria on which a user is allowed to listen to the defined channel
// Broadcast::channel('Profile.{id}', function ($user, $id) {
//     return (int) $user->id === (int) auth()->user()->id;
// });

Broadcast::channel('Profile', function () {
    return true;
});

In UserProfileComponent.vue:

created() {
        // Doesn't join private channel for some reason
        // window.Echo.private('Profile.' + this.authUser.id)
        window.Echo.private('Profile')
            .listen('ProfileUpdated', ({user}) => {
                // Code to be executed
            });
    },

Pusher debug console output:

https://imgur.com/a/0YVCnxi

I hope someone can understand better what is going on! Thanks in advance.