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Click the checkbox next to the apps that you are having problems with (e.g., GoToMeeting, etc).Click the lock icon to make changes (you will need to enter your admin password).Click Screen Recording (Left options menu).This issue may be caused by security permissions.Press the Option, Command, and Esc (Escape) keys.Quit all running apps and then try again.Visit the developer’s web site to learn more. For example, if it is Skype, in Skype, click Skype > Check for Updates. You may update on Mac from within the app.
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This article explains how you can troubleshoot when you have meeting and screen sharing problems on your Mac. They further stated that the problems started after upgrading to the latest version of macOS. Several users reported that they were unable to share their screens using online meetings and web conferencing apps (such as GoToMeeting, Zoom, Cisco Webex, Microsoft Teams, Goole Hangouts or Skype).
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