Xamarin.Forms.Essentials永远不会提示权限

我正在尝试将Xamarin.Forms.GoogleMaps与Android项目上的位置服务一起使用。我的问题是应用程序从不提示我输入位置权限。我的MainActivity.cs页面如下所示

    protected override void OnCreate(Bundle savedInstanceState)
    {
        TabLayoutResource = Resource.Layout.Tabbar;
        ToolbarResource = Resource.Layout.Toolbar;

        base.OnCreate(savedInstanceState);

        Xamarin.Essentials.Platform.Init(this, savedInstanceState);
        Xamarin.FormsGoogleMaps.Init(this, savedInstanceState);
        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
        LoadApplication(new App());
    }
    public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
    {
        Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

        base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
    }

我拥有清单文件中列出的权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.INTERNET" />

但是当我尝试使用Xamarin.Forms.GoogleMaps并设置MyLocationEnabled =“ True”时

<StackLayout Grid.Row="2">
    <maps:Map VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" MyLocationEnabled="True"> 
    </maps:Map>
</StackLayout>

我收到以下错误

Java.Lang.SecurityException：“我的位置需要权限ACCESS_FINE_LOCATION或ACCESS_COARSE_LOCATION”

该应用程序从不要求我授予我认为应处理的OnRequestPermissionsResult权限。我肯定错过了什么。我是否必须手动请求权限？