Open VPN on Synology

HI Will,

love your channel, I have been steadily modifying mu system using a number of your recommendations, the latest is OpenVPM which I am struggling with, the tutorial is straight forward, however cant see what I am doing incorrectly, I have setup the port forwarding on my UDM however I am unable to get a connection from my MAC or my Android phone.
Are you able to recommend a fault finding procedure I can follow, as I am still learning as I go?
I have a DS418, Mac Mini, Mac Notebook and an Android phone that I would like to use over the VPM.

Gary - From Aus