You need to install the app remotely using Play Store web version. The instructions are shared by @AftabINhere. That's the way I also installed the app on my TVs.
It seems early access apps aren't discoverable on TV Play Store.
I couldn't find this app in Tata Play Binge box, has they disabled this app ?
I tried installing through Google Chrome Web in incognito mode even i selected TP Binge box as installed device but I didn't find any app installed.
You need to install the app remotely using Play Store web version. The instructions are shared by @AftabINhere. That's the way I also installed the app on my TVs.
It seems early access apps aren't discoverable on TV Play Store.