Soketi Websocket with Sail, Back-end Broadcasting failing, Echo front-end succeeds?

Hello, I'm currently trying to setup Soketi to work via a fresh Laravel 9 install, following https://laravel.com/docs/9.x/broadcasting , and seem to be running into an issue when trying to get the backend to broadcast. I am attempting to do so on my localhost over port 6001 over just http, no SSL involved.

Everything seems to be functioning properly on the front-end. I am able to get Echo to connect to the server, subscribe to a channel, and send pings/receive pongs, but when I attempt to have the back-end trigger an event it seems to fail to be able to connect to the server at all?

This is the response: Pusher error: cURL error 7: Failed to connect to localhost port 6001 after 0 ms: Connection refused (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for http://localhost:6001/apps/app-id/events?auth_key=app-key&auth_timestamp=1670821955&auth_version=1.0&body_md5=db1e1ee1e7151bb41beeb2c1e03bda0b&auth_signature=3daebed024d3f0b2a7333c61e313aaf44bba436ab18a374f5472bb3181afd100.

My broadcasting.php config:

        'pusher' => [
            'driver' => 'pusher',
            'key' => env('PUSHER_APP_KEY', 'app-key'),
            'secret' => env('PUSHER_APP_SECRET', 'app-secret'),
            'app_id' => env('PUSHER_APP_ID', 'app-id'),
            'options' => [
                'host' => env('PUSHER_HOST', '127.0.0.1'),
                'port' => env('PUSHER_PORT', 6001),
                'scheme' => env('PUSHER_SCHEME', 'http'),
                'encrypted' => false,
                'useTLS' => env('PUSHER_SCHEME') === 'https',
            ],
        ],

and .env

PUSHER_APP_ID=app-id
PUSHER_APP_KEY=app-key
PUSHER_APP_SECRET=app-secret
PUSHER_HOST=localhost
PUSHER_PORT=6001
PUSHER_SCHEME=http
PUSHER_APP_CLUSTER=mt1

and docker-compose.yml additions:

    soketi:
        image: 'quay.io/soketi/soketi:latest-16-alpine'
        environment:
            SOKETI_DEBUG: '1'
            SOKETI_METRICS_SERVER_PORT: '9601'
        ports:
            - '${SOKETI_PORT:-6001}:6001'
            - '${SOKETI_METRICS_SERVER_PORT:-9601}:9601'
        networks:
            - sail
networks:
    sail:
        driver: bridge

I feel like I'm missing something simple, hoping someone can point me in a direction instead of burning another day. Thanks for your time.