When logged out, the built-in Microsoft Edge screen reader does not honor the language settings of the browser or OS regional settings. This results in ArcGIS StoryMaps containing the Swedish language being read with an English accent. When logged in to an account with a Swedish language setting, the screen reader automatically reads with a Swedish accent.
The following is a video to describe the issue: https://www.screencast.com/t/ycyDHqUf