FaceTime audio and video call requirements
To make FaceTime audio and video calls on your Mac (OS X 10.9 or later), you must meet the following requirements:
- Be connected to the Internet 
- Be signed in to FaceTime with your Apple Account - If you don’t have an Apple Account, go to the Apple Account website to sign up for one for free. 
- Have a built-in or connected microphone; for FaceTime video calls, you also need a built-in or connected camera 
The person you’re making a FaceTime audio or video call to must be signed in to FaceTime and have any of the following:
- A Mac with OS X 10.9.2 or later, and a built-in or connected microphone 
- An iOS device with iOS 7 or later 
- An iPadOS device with iPadOS 13 or later