I like to start here a dread with tips for comatibility for Fire and Android TV. It's better to take that knowledge before you design for it. For OS Fire: the default text size is bigger. If you give it enough space, it will be shown correctly.
For OS Android TV : don't use the HorizontalScrollArangement if you want to put a button in it or you can't click it with the mouse, although you can navigate to it with the arrows to press then OK. Try to use HorizontalArangement instead.
I discovered that Android 11 can mess up colors if using dark mode: if you use the build in colors, they are preserved, otherwise, check it out for yourself for inverted colors.