https://wccftech.com/user-facetime-calls-from-an-xbox-series-s-but-your-apple-tv-cannot-do-that/

With iOS 15 Apple debuted FaceTime calls on other platforms. However, the new addition is not available on the Apple TV and it is only raising more eyeballs. According to a post on Reddit, a user managed to make FaceTime calls on the TV using an Xbox Series X. Scroll down to read more details on the subject.

FaceTime calls are not supported on the Apple TV but you can set up your Xbox Series S to make calls on your TV. In a Reddit post, user u/JavonTEvans explained how he managed to make FaceTime calls on his TV using his Xbox Series S. He used a Logitech C930 webcam connected to the Xbox Series S. To join a FaceTime call, a user simply launched the Microsoft Edge browser on the console and opened an email with a FaceTime link.