It can be hard to tell if Bouncie is working sometimes. When you first install the device, it will take a few trips before Bouncie will "wake-up". While the vehicle's engine is running, you should see dimly glowing lights coming from inside the device.
If you don't see any lights, the fuse for the OBD port may need to be replaced.
If you see lights but aren't seeing any data in your app, it could be that Bouncie is not "awake" yet. After you drive your vehicle and take a few trips, Bouncie will wake up and start sending data to your app.