public LayerCreationParams( 
   Uri uri
)

{
    //Connect to the AGS service. Note: the connection will persist for the
    //duration of the Pro session.
    var serverUrl = "https://sampleserver6.arcgisonline.com/arcgis/rest/services";

    var username = "user1";
    var password = "user1";

    //at any point before creating a layer, first make a connection to the server
    //if one has not been already established for the current session
    var uri = new Uri(serverUrl);
    var props = new ServiceConnectionProperties(uri)
    {
        User = username
    };
    //It is preferred that you use the Windows Credential Manager to store the password

    //However, it can be set as clear text if you so choose
    props.Password = password; //not recommended


    //Establish a connection to the server at any point in time _before_
    //creating a layer from a service on the server
    //Note: Needs QueuedTask to run
    var gdb = new Geodatabase(props);
    gdb.Dispose();//you do not need the geodatabase object after you have connected.

    //later in the session, as needed...create a layer from one of the services
    //on the server
    var serviceUrl = "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Wildfire_secure/MapServer";
    var lc = new LayerCreationParams(new Uri(serviceUrl));
    //Note: Needs QueuedTask to run
    LayerFactory.Instance.CreateLayer<MapImageLayer>(lc, map);
}

{
  // Note: call within QueuedTask.Run()
  {
    //Create with initial visibility set to false. Add to current scene
    var createparams = new LayerCreationParams(new Uri(sceneLayerUrl, UriKind.Absolute))
    {
      IsVisible = false
    };

    //cast to specific type of scene layer being created - in this case FeatureSceneLayer
    var sceneLayer = LayerFactory.Instance.CreateLayer<Layer>(
             createparams, MapView.Active.Map) as FeatureSceneLayer;
    //or...specify the cast directly
    var sceneLayer2 = LayerFactory.Instance.CreateLayer<FeatureSceneLayer>(
             createparams, MapView.Active.Map);
    //ditto for BuildingSceneLayer, PointCloudSceneLayer, IntegratedMeshSceneLayer
    //...
  }
}