[Jordan Roy]

May be it’s because you are drag highlighting the elements on the page without actually selecting the artboard’. Dumb founded I drag highlighted the elements I wanted to copy. Then holding down the shift key I clicked on the art board. I then copied the elements, clicked on the artboard I wanted to paste into and pressed ‘Paste in place’. It worked!
Please make sure you activate the artboard you are copying from before copying. Make sure you click the artboard you get the darker outline highlight confirmation. Then you are good to go.