In my MAUI application, I need to scan for BLE devices. My code is working perfectly on Windows, however on Android, the scan does not discover any devices. I know I have to declare required permissions in manifest and interactively ask for them.

My minimum example for C#:

using Plugin.BLE;
using Plugin.BLE.Abstractions.Contracts;

namespace BLE2
{
    public partial class MainPage : ContentPage
    {
        private IAdapter adapter;
        private IBluetoothLE ble;
        private List<IDevice> devices = [];

        public MainPage()
        {
            InitializeComponent();

            ble = CrossBluetoothLE.Current;
            adapter = ble.Adapter;
            adapter.ScanTimeout = 3000;
            adapter.ScanMode = ScanMode.Balanced;

            adapter.DeviceDiscovered += (sender, eventArgs) =>
            {
                devices.Add(eventArgs.Device);
            };
        }

        private void OnScanBtnClicked(object sender, EventArgs e)
        {
            adapter.StartScanningForDevicesAsync();
        }

        protected override async void OnAppearing()
        {
            base.OnAppearing();
            await RequestPermissionsAsync();
        }

        async Task RequestPermissionsAsync()
        {
            var locationPermitStatus = await Permissions.CheckStatusAsync<Permissions.LocationWhenInUse>();
            if (locationPermitStatus != PermissionStatus.Granted)
            {
                await Permissions.RequestAsync<Permissions.LocationWhenInUse>();
            }

            var bluetoothPermitStatus = await Permissions.CheckStatusAsync<Permissions.Bluetooth>();
            if (bluetoothPermitStatus != PermissionStatus.Granted)
            {
                await Permissions.RequestAsync<Permissions.Bluetooth>();
            }
        }
    }

}

and the AnddoidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application android:allowBackup="true" android:icon="@mipmap/appicon" android:supportsRtl="true"></application>
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
    <uses-sdk />
</manifest>

“Watching” properties while debugging shows that ale permissions are granted. However, the event adapter.deviceDiscovered is never fired (again tested with a breakpoint).

What have I missed?