Show device usage consent dialog in Unity app for

Question

I'm working on application for Hololens built on Unity. My need is to get some information from phone(android or wp - doesn't really matter) using Bluetooth Service Port Profile. The chosen approach is to make a Hololens act as Bluetooth Host. So I'm using RfcommServiceProvider for this. The simplified sample:

_rfcommProvider = await RfcommServiceProvider.CreateAsync(RfcommServiceId.SerialPort);
_socketListener = new StreamSocketListener();
_socketListener.ConnectionReceived += OnConnectionReceived;
await _socketListener.BindServiceNameAsync(_rfcommProvider.ServiceId.AsString(),
                                             SocketProtectionLevel.BluetoothEncryptionAllowNullAuthentication);
_rfcommProvider.StartAdvertising(_socketListener, true);

And event handler like:

private async void OnConnectionReceived(StreamSocketListener sender, StreamSocketListenerConnectionReceivedEventArgs args)
{
    _socket = args.Socket;
    ...
}

The issue is next: when client device tries to connect - user need to grant permission for this app/device pair. If use this code in UWP app on hololens - system consent dialog appears. But when it's Unity app - it just failes on attempt to get socket in event handler. To fix this user need to close app, go to Settings > Privacy > Other devices and turn on switch button for device/app pair(this button appears there only after first attempt to connect to Hololens app).

So the question: is there a distinct way or some workaround to ask user for this permission inside Unity app?