Why doesn't pusher-event work in Laravel?

Question

Laravel

Set up notifications in laravel as follows:

.env:
BROADCAST_DRIVER=pusher

PUSHER_APP_ID=here is my id
PUSHER_APP_KEY=here is my app_key
PUSHER_APP_SECRET=here is my app_secret
PUSHER_APP_CLUSTER=ap2

broadcasting.php:

'pusher' => [
            'driver' => 'pusher',
            'key' => env('PUSHER_APP_KEY'),
            'secret' => env('PUSHER_APP_SECRET'),
            'app_id' => env('PUSHER_APP_ID'),
            'options' => [
                'cluster' => env('PUSHER_APP_CLUSTER'),
                'useTLS' => true,
            ],
        ],

challenged.php:

<?php

namespace App\Events;

use App\Models\Challenge;
use Illuminate\Broadcasting\Channel;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Queue\SerializesModels;

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

    public $challenge;

    public function __construct(Challenge $challenge){
        $this->challenge = $challenge;
    }

    public function broadcastOn()
    {
//        return new Channel('challenge-channel');
        return ['challenge-channel'];
    }

    public function broadcastAs()
    {
        return 'challenge-event';
    }
}

Event declaration:

$challenge = (new Challenge())->create($challenge_fields);
event(new Challenged($challenge));

But there is no reaction to the event. When I send it through the debug console, everything works fine.