Okay... This is an open question because I don't know where to search.
Is it possible to use the WebViewer component and, first save, then use the user access token to regain access to a website?
The webpage in question could be this: https://skoleportal.easyiqcloud.dk
There are several identification methods on the site!
My goal is to make autologin when opening the URL in WebViewer.
Does the website have a remember me checkbox? If so, the webviewer should store cookies to allow the login to persist. This works for a google account sign up in the native webviewer.
1 and 3 are working perfectly with the idea from @TIMAI2
2 MitID is different? mitID is't a government-citizen login, so probably not much can be done about it.