When creating a new user in PlatformUI and going back to Insite/Page of eZ Studio a user sees in the preview a website with user profile. This is unexpected behaviour. We should check whether the content we create (user is a content) belongs to proper content group, the Content group in this case, and then prepare the URL where a user will be redirected to after clicking on Siteaccess: site link.
See video: https://www.youtube.com/watch?v=HKOKvxXFml0