Error: Why does screen sharing not work?

1. Someone is using Chrome or Firefox on an Apple device: In this case, please check in the settings of the browser (often the three dots at the top right) under Settings/Data Protection whether the browser has permission to share the screen.
2. Check whether the moderator has allowed the participants in the room to share the screen.
3. Check whether the presenter has the function to share your screen.

Source: ILIAS learning module "Information and learning videos on BigBlueButton".