Thanks, Dan,
I’m pretty sure it is the correct URL. It’s the login URL, which works just fine. See https://my-app-zeta-nine.vercel.app/
Thinking about the HAR file:
I’m not certain, why You need one. Just visit the app https://my-app-zeta-nine.vercel.app/ with the tools You require. I wound do anything different. The app is a complete reproduction and shows the error. At least on my browsers.