Can't share screen when someone else logs on

I started a meeting and has my screen shared.  I invited someone and as soon as they log in, I get a box that pops up that tells me I'm restricted from sharing.  I have combed through the message boards and checked/unchecked just about every box and nothing works.   I'm on a MacBook Pro.  Never had this issue with my PC.  :-(. And of course I need to be on a meeting tonight that I need to share my screen.

Box says Bc I am restricted from screen sharing when external users are present, my screen sharing has stopped.  It's my account, how am I restricted??