Laravel Reverb is not receiving event in front end and giving pusher error

I'm using Laravel 11 and Reverb for real-time updates in my application.

In the backend, I have tried both helpers: event(new App\Events\FirstEvent($mob, $username, $id, $message, $content, $msgid, $language, $status)); broadcast(new App\Events\FirstEvent($mob, $username, $id, $message, $content, $msgid, $language, $status));

In event i'm using ShouldBroadcastNow.

When running the server with " php artisan reverb:start --debug" , I am getting:

Message Received ........................................................................................................ 137685220.94210843

1▕ { 2▕ "event": "pusher:ping", 3▕ "data": [] 4▕ }

Message Handled ......................................................................................................... 137685220.94210843

But in the frontend, there is no data. While checking the logs, I am getting the following error: Pusher error: 404 Not Found Not Found. The requested URL was not found on this server. Additionally, a 404 Not Found error was encountered while trying to use an Error Document to handle the request.

This error is occurring when the event is triggered. Can anyone help me with this? @laryai