If you are using macOS 10.15 Catalina, you need to allow Screen Recording in Privacy Settings. Read the step-by-step guide below or watch our instruction video.
Once you press the “Start Mirroring” button, your Mac will show this message:
Please select “Open System Preferences” and go to “Security & Privacy”:
Then go to the “Privacy” tab and select “Screen Recording”:
Then click on the checkmark next to the screen mirroring app you are using:
When you have the screen mirroring app opened, you will see this message; please select “Quit Now”:
Now it is done. Just open the app again and enjoy mirroring!