Putting it through the press!
So the CNC milling machine did cut it too deeply! So the ink sat too deeply in the plate so the paper couldn't touch it, so all I got is a relief of the plate tone I created on the zinc plate. I was advised to role the ink thinly and evenly over the plate on my second attempt,this technique is called reverse intaglio. Not the outcome I wanted but it is a great outcome, so it is something I will work on further.