Click the Start authorisation button
You will be taken to the login page for AuroraPlus.
Make sure to check “Keep me logged in” to get a long-lived RefreshToken
After logging in, you will get the Cradle Moutain error page.
Copy its entire URL from your browser's address bar, and come back to this page.
Warning
This way of getting authentication details is not safe in general. It is the backbone of the ConsentFix credentials-stealing attack.
Unfortunately, there is no other known way to obtain your AuroraPlus credentials for HomeAssistant in this case.
In general, though, a legitimate site or app would never ask you to copy/paste a URL from another tab to
authenticate.