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My hardware does not connect to the nRF Toolbox Android app does but works just fine with the nRF Toolbox iOS app

I have a custom BMD-350 board with a UART service. The board connects just fine with the nRF Toolbox iOS app but does not work with the Android app.
The app connects to the device but then abruptly disconnects. 

Here's the log:
2019-12-11 18:54:59.556 24369-24382/no.nordicsemi.android.nrftoolbox D/BluetoothGatt: onSearchComplete() = Device=FC:A4:01:7B:8E:5A Status=0
2019-12-11 18:54:59.569 24369-24382/no.nordicsemi.android.nrftoolbox D/BluetoothGatt: onClientConnectionState() - status=22 clientIf=8 device=FC:A4:01:7B:8E:5A
2019-12-11 18:54:59.616 24369-24369/no.nordicsemi.android.nrftoolbox I/BleManager: Services discovered
2019-12-11 18:54:59.643 24369-24369/no.nordicsemi.android.nrftoolbox W/BleManager: Device is not supported
2019-12-11 18:54:59.669 24369-24369/no.nordicsemi.android.nrftoolbox V/BleManager: Disconnecting...
2019-12-11 18:54:59.703 24369-24369/no.nordicsemi.android.nrftoolbox D/BleManager: gatt.disconnect()
2019-12-11 18:54:59.703 24369-24369/no.nordicsemi.android.nrftoolbox D/BluetoothGatt: cancelOpen() - device: FC:A4:01:7B:8E:5A
2019-12-11 18:54:59.730 24369-24369/no.nordicsemi.android.nrftoolbox D/BleManager: [Callback] Connection state changed with status: 22 and new state: 0 (DISCONNECTED)
2019-12-11 18:54:59.753 24369-24369/no.nordicsemi.android.nrftoolbox W/BleManager: Error: (0x16): GATT CONN TERMINATE LOCAL HOST
2019-12-11 18:54:59.770 24369-24369/no.nordicsemi.android.nrftoolbox I/BleManager: Disconnected
2019-12-11 18:54:59.794 24369-24369/no.nordicsemi.android.nrftoolbox D/BleManager: gatt.close()
2019-12-11 18:54:59.794 24369-24369/no.nordicsemi.android.nrftoolbox D/BluetoothGatt: close()
2019-12-11 18:54:59.794 24369-24369/no.nordicsemi.android.nrftoolbox D/BluetoothGatt: unregisterApp() - mClientIf=8

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