Greetings, @rosee.
Thanks for reaching out to us about having an issue with the app not being compatible with your device. We're here to help.
Could you please try to uninstall and re-install the app? Let's see if that would make any difference.
Furthermore, you may visit this support article on how to fix error "The app isn't compatible with your device" in the Roku Smart Home mobile app
Please keep us posted.
Thanks,
Roku Community Team
Reynan L.
Roku Community Moderator