Demo does not seem to work

[jwoertink]

I cloned the repo and ran yarn, then yarn start. The demo does boot up, but when I put my Flussonic ingest server as the "host" value, and my stream key in, I just get a lot of errors in the console.

WebSocket connection to 'wss://my.flu.server/staging/whip/webrtc' failed: 
(anonymous) @ index.js:884
play @ index.js:11620
PUT https://my.flu.server/staging/whip?token=eyJ0eXAiOiJK/sessions/ 400 (Bad Request)
Player::Ws connection closed CloseEvent {isTrusted: true, wasClean: false, code: 1006, reason: '', type: 'close', …}
index.js:11677 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading '0')
    at index.js:11677:22
(anonymous) @ index.js:11677
Promise.then (async)
getCapabilities @ index.js:11676

Is this demo code still relevant? I'm also trying to follow along with https://flussonic.com/doc/video-playback/webrtc-playback/

I'm not exactly sure what I'm supposed to enter in these fields, but I am able to do publishing through my own app, so I tried using the WHIP URL that I use for my app.