A20 no audio on headphone jack

[filmacu]

Hi, currently running Bullseye on a Rev M board, I have audio via HDMI but not via the headphone jack. When I run aplay -l I can see two devices listed the HDMI and an ananlog output.
Also via the UI sound menu I can also see two outputs listed. When I select the first 'analog' output audio plays via the HDMI, however when I select the second 'analog' I don't have any headphone jack output. I have checked the overlays in /dev/sbin and I can't find an option that could affect this.
I am probably doing something silly!!!
Regards,
Phil