Vland tail lights not working

[Tycho24]

Dear reader,

I bought a set of 'Vland' smoke led tube taillights for my Polo 6r 2011 1.2tsi 105pk.

I installed the rear lights but only the turn signals and the rear fog light only work, the rest does not.
I have already tried to swap the inverters and wiring harnesses of the lamps, but this did not give any other result.

I just tested the lights in another polo (6r 1.2 70hp 2011) owned by a friend of mine, and the lamps work perfectly!

Another friend of mine also has these lights in his polo 6r 1.2 tsi (90hp) so it should be possible.

So the problem is with the car…
But now I'm wondering where the problem is, and if anyone has experience with this problem