Broadcasting and Ably

$admin = User::first();

Notification::make()
    ->title('Saved successfully')
    ->broadcast($admin);

BROADCAST_CONNECTION=ably
...
...
ABLY_KEY=first:last // my ably key
VITE_ABLY_PUBLIC_KEY=first // first part 
ABLY_TOKEN_EXPIRY=21600

import Echo from 'laravel-echo';

import Pusher from 'pusher-js';
window.Pusher = Pusher;

window.Echo = new Echo({
    broadcaster: 'pusher',
    key: import.meta.env.VITE_ABLY_PUBLIC_KEY,
    wsHost: 'realtime-pusher.ably.io',
    wsPort: 443,
    disableStats: true,
    encrypted: true,
});