I see the error "Tab recording is not supported yet"

While creating a screen recording: 

1. Please choose "Your Entire Screen"
2. Click on the screen you would like to record
3. Click "Share."

Note: Please do NOT choose "Share audio" from this screen. If you choose "Share audio," the computer immediately begins searching for audio coming from the computer and will shut down the recording in a few seconds if audio is not playing. 

Here is a quick video to demonstrate how to share your screen: