In the Service Menu, if you use an arrow key to reach a Announcement V2 slide the arrow keys are disabled, however, if you click on the V2 slide, the arrow keys still work.
Therefore, you can't go through your presentation slide by slide using the down arrow key without clicking on each V2 slide you encounter before proceeding.
Windows 10
P.s. I might mention, this is "Off Air" only, seems to work as expected in Preview or On Air