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