I understand that Duplecast IPTV does not currently support Android TV. If you wish to install and use Duplecast on an Android TV device, you will need to check for updates or announcements from the Duplecast team regarding support for Android TV. It's possible that they may release a compatible version for Android TV in the future.
In the meantime, you can explore other IPTV applications available on the Android TV platform for streaming your favorite content. Keep an eye on Duplecast's official website or contact their support for any updates regarding Android TV compatibility.