You can add people to your Apple TV using the Home app on an iPhone, iPad or Mac (with macOS Catalina or later).
The Home app lets you add multiple users at the same time and customise each person’s access by device. For example, you can set up an Apple TV in the kids’ room with a child account and set up another Apple TV in the living room with both parent and child accounts.
Make sure your Apple TV is , select Home Settings Upgrade to the new Home architecture.