Ok Les - I have one of these and should be able to help...but I need some more info. What are you trying to run on the Samsung Tab?
There is a known issue with Zwift Mobile Link and Android devices regarding bluetooth. Basically the issue here is that there are too many different possible Android configurations (hardware and software/firmware) and software developers are struggling with the combo. Also there's no Android Zwift application...only Zwift Mobile Link which allows you to have controls at your bike when running Zwift on a PC or Mac. So you can't get on Zwift on that tablet like you could if you had an iPad.
One thing to know about Bluetooth Low Energy (BLE) is that it will only pair to one thing at a time and it also allows the software to pair to the device. What This means is that you do NOT want to go to the bluetooth settings on your phone and pair to the trainer. If you do that the application you are trying to run cannot pair to it. Also of note on the Qubo is that it will NOT dual broadcast. By that I mean that it you pair to it via BLE it will no longer broadcast the ANT+ signal and vice versa. Many trainers dual broadcast but not the Qubo.