∞ Apple Support: How to watch together on your Apple TV during a FaceTime call:
Another excellent Apple Support video. This one walks through the process of syncing your Apple TV watching experience with other folks on a FaceTime call.
Interesting that the Mac is not mentioned, even though SharePlay via FaceTime was introduced in macOS Monterey 12.1, as described here.
No matter, good to see the SharePlay process in action. Well done.
Source: The Loop