If you select Kiosk Mode to launch the browser full-screen, Microsoft Edge will open an InPrivate window in full screen. This may prevent Edge from leveraging the Automatic logon only in Internet zone setting.
To work around this limitation, set the InPrivateModeAvailability registry key to 1, which disables InPrivate mode.
To learn more, see Microsoft Edge Browser Policy Documentation InPrivateModeAvailability | Microsoft Learn
