If you are unable to share your screen, you may need to adjust your Chrome browser settings to allow for screen sharing.
To check and/or adjust your Chrome browser settings navigate to your System Preferences. You'll then select Security & Privacy
Click the Privacy tab within the window, and select Screen Recording. Check the box for the applications you would like to have permission for screen sharing; for InSpace, this is Google Chrome.
Click Quite & Reopen in order to implement the new settings.