Message says network unavailable on LG TV.

Hey NatLoc,

It appears that you're having a problem using the Apple TV app on your LG TV, and we're glad to provide assistance.

Apple TV app - Devices - Apple -- Make sure that your model of LG TV is supported by the Apple TV app.

Reset the Apple TV app - Apple Support -- If it is, try resetting the Apple TV app.

Feel free to get back to us with any questions or problems you may have.

All the best.

It’s very finicky, just keep hitting the “Try again” button until the App loads the Home Screen.

You might face other issues during your streaming session like DRM issue, just keep “Try again” and with some luck it might work.

AppleTV app on smart TVs is definitely due for an update.