I am sorry to say I discovered that it is not designed for tablets. From the developer:
Believe it or not this would require substantial effort. It sounds trivial but its not. And the rewards are minimal. Basically we have to stick to work that covers the latest number of devices and users for the least effort.
Sorry for any misinfo on that point.
Thanks. Yeah, I'm not surprised. You'd think that if it's android and has a sim that it'd be a no-brainer. But a lot of apps don't work on the tablet.