I have a Fire TV Cube and (2) Amazon Echo Studio Speakers. They are all on the same network and all in the same group on the app. When I try to set up a Theatre in the app with the three of them the app tells me my Fire TV Cube is not supported, when I know it is because my brother has the same set up. Is there something I'm doing wrong? I can't set it up either on the Fire TV Cube.