Can’t mirror Peacock on Apple TV? Anyone know how to fix?

What is your model Apple TV? Identify your Apple TV model - Apple Support

The Peacock TV app is available for Apple TV (4th generation or later), tvOS 13 or later.

Peacock doesn’t mention support for AirPlay at all. It may be blocked.

What devices and platforms are supported by Peacock? - Peacock TV Help Center

I use the Peacock App which available on the Apple TV...no streaming required.