Microsoft Teams Full Screen

I am using Libreoffice to give a presentation on Microsoft Teams. When I select ‘slideshow’ I get the required full screen but those sharing the meeting do not. What am I doing wrong?

Note that you need to enable screen sharing (middle icon on the teams meeting toolbar, select Desktop - Screen 1/2). If you have one screen only, you must start sharing before you start the slideshow.

The installed Teams app works better with fullscreen sharing than the web app. If you must use the web interface, use a system browser (Internet Explorer or Edge on Windows, Safari on a Mac).

If all else fails, run the presentation in a window and share that.