You can share your local audio output with team members in a conference call by activating the feature when sharing a screen or a window. If you share a window with activated audio sharing and just close the window, the window sharing itself officially terminates. However, system audio sharing remains active!
In our opinion this is a critical privacy bug! If you aren't aware of this (in our opinion wrong) behavior you might share your audio with the complete audience unwillingly and without noticing. Depending on whatever that audio content might be, it can have dramatic consequences for you, for the team and for the company!