2009 Micra C+C Aux Radio Help

Hi I’m new here please bare with me.

Just bought a 2009 Micra C+C and love it!
It is the 25th Anniversary special edition with the iPod dock.

The car comes with the stock 6 cd Bluetooth radio with Aux button so I assume the Aux is for the iPod dock.

Under the iPod dock there is a spare plug that fits the standard Aux socket that are found in most k12 Micras. So I went ahead and bought the socket from eBay, connected it.., but when I switch the radio on and press the Aux button.., all the radio displays is “No Aux”. See pics.

Even with the iPod dock connected it says “No Aux”.

does anyone have any suggestions on this as to what I can do?