Can't see APR Brother 401 Sensors in Android App

We are using the AprilBrother Android application on GooglePlay and we do not see our APR Brother 401 beacons. They are both powered up as we can push the buttons and the corresponding LEDs light up. We are using a device that is BLE compatible. What could be the issue?

Hello,

Here’s a demo for ABSensor 401. Please have a try.