Sadsack

Hi all, newbie here. My son has recently purchased a 2017 mk3 S line and all has been well for 3 months until yesterday. Whilst driving away from a roundabout, the elm Cameron. No symptoms of anything wrong, all still working fine. No rough idle and no lack of power. We used a generic code reader and pulled up P0441, evap error. Checked the fuel cap was closed properly and then we started looking for the valve that all forms of info talk about ( N80).
I can’t find it so can any of you lovely people point me in the right direction please. Ta