My 2022 Ducato is a Devon Aztec XL so it's a PVC.
That cable looks like an aftermarket addition and although I don't have anything exactly like that I have one cable from the tracker routed through in that corner into the engine compartment which connects to, and immobilises, the starter solenoid. There's also one on the drivers side through into the engine compartment for the alarm siren.
I have
Multiecuscan but live in the South East so a long way from you so can't help there.
Removing the glove compartment once you manage to drop down the front cover is relatively easy, just a number of torx screws, and it pulls off towards you with the SGW, if you have one, attached to the back.