"Allow PowerPoint sharing" option not working

The "Allow PowerPoint sharing" option is enabled, but users are not seeing "PowerPoint" column when they share the screen to participant. Normally, users should see "Desktop", "Window", "PowerPoint", "Browse" and "Whiteboard" if everything is enabled and working as expected.

Any idea?

 

P.S: I also have Skype for Business running side-by-side with Teams in Island mode.