Send me one of those tablets (exact same model) and tell me what OS you are using (when it’s a Mac, you’ll have to send me whatever computer you are using as well) and I will do some troubleshooting. This tablet should work in Blender!
No, but seriously I can’t help. Tried to find a bug report with this tablet, but all I could find was this: https://developer.blender.org/T51320
Might want to read that, so that you know what you are up against;)