pusher is not working

i am watching a video on Laravel WebSockets

In my env file i have these:

PUSHER_APP_ID=staging PUSHER_APP_KEY=staging PUSHER_APP_SECRET=staging LARAVEL_WEBSOCKETS_HOST=127.0.0.1 LARAVEL_WEBSOCKETS_PORT=6001 PUSHER_SCHEME=http PUSHER_APP_CLUSTER=mt1

when i try to connect in beyondcode/laravel-websockets dashboard it shows error

{"ok":false,"exception":"Pusher error: auth_key should be a valid app key\n."}

why its not working for me when its for the person who is making video tutorial. please help

i am using laravel 9