broadcast notification failed with curl error 3 - malformed url

I'm having trouble getting the broadcast notifications working. I'm getting an error in Illuminate\Notifications\Events\BroadcastNotificationCreated.

Looking in dev tools, this is what I see as the first part of the URL:

https://sockjs-${pusher_app_cluster}.pusher.com/pusher/app

config/filament.php has these keys that I don't have values for in my .env file and nothing is mentioned about them in the docs:
 'wsHost' => env('VITE_PUSHER_HOST'),
            'wsPort' => env('VITE_PUSHER_PORT'),
            'wssPort' => env('VITE_PUSHER_PORT'),


Can anyone give me some guidance on what might be going wrong?
Solution
Was able to fix this by commenting out some of the variables in the broadcasting config built into laravel. Doesn't make sense, but it's working. i'll take the win and move on.
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