Sign in to or out of FaceTime on Mac - Apple Support
https://support.apple.com/guide/facetime/sign-in-to-or-out-of-facetime-on-mac-fctme7243ba3/mac
WEBSign in to FaceTime. You can use your Mac to make and receive calls when you’re signed in to FaceTime. You need to sign in the first time you open the app, or if you’ve signed out. In the FaceTime app on your Mac, enter your Apple ID, then click Next. Enter your password, then click Next to sign in.
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