I've registered on the ateca forum after repeated failures to register on tiguanforums, possibly because I tried a username with an apostrophe in it. Anyway, I wanted to see if my experience might be of some help to Rory, whose post to tiguan forums first caught my eye, then I found him on here. Hi Rory!
I'm still a relative Tiguan virgin, having bought mine in Nov 2020 with something like 43000 miles on the clock. Its MOT from 2020 (its first) notes wear on the inner edge of the offside rear tyre. A check on tyre date stamps shows the rear tyres to be original to the car, but the fronts are newer.
Several decades of VWs on twisty roads in SW Scotland have taught me that worn front lower arm rear bushes will predictably produce wear on the inner front tyre edges. So I checked the front offside tyre on the Tiguan, and it was clearly wearing on its inner edge, showing the early stages of the same wear pattern as the offside rear.
At this point I opted not to even try claiming on the VW Approved Used warranty but replaced the bushes myself as I normally would. The outer metal of the bush on the front offside was almost completely separated from the rubber, though it's almost impossible to see the bush without removing the arm from the car first.
If I had any doubts about the bush deterioration being the cause of the tyre wear, these disappeared on the first trip out after they were replaced. After some 20 miles, the tyre pressure monitor went off, but the tyre pressures were all fine. That was the first and only time the tyre monitor has ever sounded, and I concluded that the system had detected a new and different rolling circumference from the tyre which was no longer scrubbing on the front offside. So I reckoned I had correctly identified the original problem.
I'll never know for sure, but I suspect that a front - rear wheel swap was carried out early in the car's life, shifting the unevenly worn tyre to the rear, possibly at a VW service. In time the swapped fronts would reach end of life without arousing suspicion and would be routinely replaced, leaving an unexplained (and uninvestigated) uneven wear pattern to be subsequently commented on at the first MOT. If I'm right about this, it suggests that VW will work hard to prevent these bushes falling victim to warranty claims.
So my conclusion is that these bushes are probably beginning to weaken within the first three years of the life of a Tiguan, because that is the only plausible explanation for the wear history on my car. It would be interesting to know if front - rear wheel swaps are carried out at dealer services, because that has the effect of removing the evidence trail, if uneven tyre wear due to bush wear should show up later.
I am aware of the outside possibility that uneven wear is occurring on the rear tyre in that position, since this apparently can happen with this suspension type. This doesn't remove the bush as the cause of the wear on the front tyre, however, I'm satisfied I've got that right.
Incidentally, the VW manual pages state that no alignment check is required after replacement of these bushes.
I hope there's something in this for you, and best of luck whatever you end up doing!
John