I will keep testing, but I thing it is going like I am expecting now. I can feel the lead screws making small movements while printing so something is happening.
No problem, there are so many features in RRF that we don't expect users to know them all. Plus it's called "orthogonal axis compensation" in the documentation, whereas I agree that skew compensation is a better name for it.
@xhobophobiax Please ensure you have some additional security in place. If you forward the Duet does not use HTTPS so the communication between you and the Duet is not secure. It would be easy for someone else on the external network (or internet if you are forwarding to the internet!) to control the printer - possibly damaging it or putting it in a dangerous state. I highly recommend using a VPN or a secured connection to a machine on the local network and then control the duet that way.