Pusher error: auth_key should be a valid app key

guys I did try work with edit and when I click on submit I have this error, but the changes was done and I am guessing why I have this issue

Pusher error: auth_key should be a valid app key .

This is my 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'),
            'encrypted' => false,
            'useTLS' => false,
            'scheme' => 'http',
            // 'host' => env('PUSHER_HOST'),
            // 'port' => env('PUSHER_PORT', 6379),
            'scheme' => env('PUSHER_SCHEME', 'http'),
            'curl_options' => [
                CURLOPT_SSL_VERIFYHOST => 0,
                CURLOPT_SSL_VERIFYPEER => 0,
            ]
          
        ],
    ],

And this .env file

PUSHER_APP_ID=995591
PUSHER_APP_KEY=644a4ac1988060882370
PUSHER_APP_SECRET=739696537f4fb23b8fcd
PUSHER_APP_CLUSTER=ap1
PUSHER_PORT=6379
PUSHER_SCHEME=http
PUSHER_HOST_PROXY=${HOST}
PUSHER_PATH_PROXY='/websockets'
PUSHER_PORT_PROXY=443
PUSHER_HOST=127.0.0.1
MIX_PUSHER_HOST=${HOST}

via Chebli Mohamed