Mine is running a rooted full android firmware and using Magisk.The shield runs Android TV - should work fine. I have two boxes with "normal" android and they are running fine. Make sure you have the latest version of the addon and go into settings and install widevine before logging in.
Mine is working fine. I was runnnig on an old version 0.24.4 but upgraded to latest 0.25.3 and working fine on my windows pc