access denied tring to save a file uwp xamarin

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access denied tring to save a file uwp xamarin - 

 FolderPicker folderPicker = new FolderPicker();
            folderPicker.FileTypeFilter.Add("*");
            StorageFolder folder = await folderPicker.PickSingleFolderAsync();
            if (folder != null)
            {
                StorageApplicationPermissions.FutureAccessList.AddOrReplace("PickedFolderToken", folder);
            }
            StorageFolder newFolder;
     
            newFolder = await StorageApplicationPermissions.FutureAccessList.GetFolderAsync("PickedFolderToken");
            await newFolder.CreateFileAsync("test.txt");
            // Fails. Same folder, create from path with an added file name.

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