Tablets aren't supported. The Galaxy is supported but there's a known Setup hurdle with Samsung phones as mentioned in this FAQ.
As we say there:
Some Samsung phones implement Bluetooth in a way that is less than ideal for our setup needs. The cause is known but complex to explain, but for these phones setup reliably fails the first time. Thankfully the fix is simple: - Unplug and replug the adapter. - Visit the Bluetooth settings in your phone and manually pair the adapter. - Go back to the app and start the setup process again. Please give this a shot and let us know if it doesn't work.