Screen Sharing On Mac

On Mac's, your computer will require some additional permissions in order to screen share. You can check those permissions with the following steps:

1. Head to "System Preferences" -> Security & Privacy
2. Click the "Privacy" tab. On the left, look for "Screen Recording" then on the right, make sure the browser you are using is checked. In this case, Google Chrome. 
3. That's it! Your browser now has permissions to share the screen. You may need to quit the browser and re-launch it for the new settings to take effect.