Apple TV does not support VPN, however, it is possible to airplay content from IOS or Mac to your TV via your ATV.

Firstly , on your Apple TV make sure airplay is enabled  settings > airplay > on

1. For Mac, follow the instructions from Apple here.  
2. Connect to VanishedVPN
3. Start streaming content on the Mac, and it should play on your TV

For IOS,

1. Make sure you’re on the same network as your ATV.
2. Swipe up from the bottom of the screen to activate control centre
3. Tap ‘airplay’
4. Choose the name of the ATV that you want to connect to
5. Connect to VanishedVPN
6. Start playing the video, and it should play on your TV via the ATV.