When attempting to add a polyline to a map using BingMapLayer the graphic does not render if I use the wkid of the layer, 102100. If I use null or 4326 the graphic renders. Curious as to why the wkid from the BingMapLayer itself does not allow for rendering of the polyline.
Please refer to codepen for sample which allows you to toggle values
https://codepen.io/bsanti-the-decoder/pen/oNOXrqw