can't display on tv

Alright. Then you’ll need an external streaming device connected to your TV via HDMI, in order to access Apple TV content on your TV.

Apple TV box, Roku, Fire TV, Nvidia Shield, ‘Chromecast with Google TV’, PlayStation [4, 5], Xbox [One, One S, Series X, Series S]. A few cable boxes from certain TV providers may also support apps, possibly including the Apple TV(+) app.

What is your model TV?

Get the Apple TV app or Apple TV+ app on your smart TV, streaming device, or game console - Apple Support

List of Apple TV app-supported devices - Apple

All the ways to watch Apple TV+ - Apple Support

↳ Watch on your TV

Are you trying to AirPlay to the TV? You will need to enable screen mirroring in order to play from an iPhone for example to your TV. Also, both the device your are playing from (i.e. iPhone) and the TV need to be on the same network to communicate.