Safari can't connect to secure laravel websocket

[Sairahcaz]

I already asked this question on stackoverflow, but nobody answered:
https://stackoverflow.com/questions/70464828/safari-cant-connect-to-secure-laravel-websocket

So maybe here somebody can help me?:

I'm running an app, where I use laravel-websockets, with the pusher replacement and a self created websocket instance. For SSL I used a letsencrypt certificate and the nginx reverse proxy "Same location for websockets and web contents" approach. On my nginx TLS 1.2 and 1.3 is enabled. Now on Firefox and Chrome all is working fine, but on Safari (version 14.1.2, tested on a macOS Mojave 10.14.6) I get the following error in the console:

WebSocket connection to 'wss://example.com/app/asdfasdf?protocol=7&client=js&version=7.0.3&flash=false' failed: Unexpected response code: 401

These are my echo options:

const echoOptions = {
  broadcaster: 'pusher',
  key: process.env.MIX_PUSHER_APP_KEY,
  cluster: process.env.MIX_PUSHER_APP_CLUSTER,
  wsHost: window.location.hostname,
  wsPort: 80,
  wssPort: 443,
  forceTLS: true,
  enabledTransports: ['ws', 'wss'], // <-- disable pusher api fallback
  disableStats: true,
};

window.Echo = new Echo(echoOptions);

I searched a lot for any kind of similar issues, but I can't find an answer.

Any ideas or help would be awesome!