Return recent or missed FaceTime calls on Mac
You can quickly return a recent FaceTime call (including calls you missed) from FaceTime, Notification Center, a reminder, or the Dock. (See FaceTime requirements.)
On your Mac, do one of the following:
Return a call from FaceTime: Click All or Missed in the FaceTime window to see a list of recent FaceTime calls you made, received, or declined. Then click the Video button
or the Audio button 
next to a call (or use the Touch Bar).Tip: A Group FaceTime call remains active until all participants leave the call. To join or rejoin a group call that’s still in progress, click the Join Video button
.Return a missed call from Notification Center: Click the date and time in the menu bar at the top of the screen to see notifications, then click a call in the list of missed calls. See Receive, pause, or stop notifications.
Return a call from a reminder: Click the link in a FaceTime reminder. (A reminder is created automatically when you decline a call and set a reminder to call back later. )
Return a call from the Dock: Control-click the FaceTime icon, then click a call below Recent Calls.
If you don’t see the FaceTime icon in the Dock, you can add it.
You can’t call someone who’s restricted by communication limits in Screen Time.