Laravel Pusher Websocket Not Working on HTTPS

You are not connecting to the correct port, or the default port is by Echo is not the default you should use for pusher. Define the correct port inside your JavaScript frontend .env file. (I don't know your repositories settings, but sometimes you can use a .env.local file, for example in a Vue setup).

Pusher seems to use default web ports 80 and 443, as described here: https://pusher.com/docs/channels/library_auth_reference/pusher-websockets-protocol

After you defined the port inside your .env, change your JavaScript code:

wsPort: process.env.MIX_PUSHER_WS_PORT, 
wssPort: process.env.MIX_PUSHER_WSS_PORT,

Don't forget to rebuild your frontend.