Hi, welcome to the club!
As Chippie says, this is a known issue and well documented, so use the Search box and you'll find several articles detailing the problem and fixes.
It will be either the switch in the boot floor below the silver latch cover plate or one where the lock is in the tail gate, have a quick search, there was a recent post where it was the tail gate lock
Hey did you ever sort the issue with your lights?Hello to everybody
I have a problem with the tailgate lights on my Audi q3. The light sometime work, but every few days they stop working. When they does not work,the bumper lights go on. Does somebody have the same problem? It look like the tailgate is open. View attachment 1928
Hey did you ever sort the issue with your lights?
I e got the same problem with mine.
For me it was the small mi ro switc in the boot. I posted a picture with the explanattion.
It is not expensive- 23 Euros from my authorized dealer. But you should chech the other options. For me that was the problem.Where did you manage to get the switch from and how much did it cost?