VW are usually one of the slowest manufacturers to update their quarterly Motability price lists and often additions and deletions, when the list is eventually published, are news to the dealers just as they are to us!
That being said, as a previous owner of 4 x Tiguan 4Motions, I went on to the VW website out of curiosity to see if they have finally added leather trim as standard to the Elegance model (they haven’t) and noticed that you cannot ‘build’ any 4Motion models on the Configurator. As to whether this is a system error or an indicator that VW has a problem with 4WD models I have no idea, but it would be very odd for Motability to add the cars to the scheme if they aren’t available.