There's a technical service bulletin, or whatever BMW calls it about that. Manufacturing defect caused by overtightening the light when first built. I have the same problem. Part can be found for around $127 on various sites that sekk OEM parts. If you look hard, you may find one on used part sites for a lot less.
I went to the dealer to see if BMW would repair as a courtesy since they admitted there was a problem. Not gonna happen. I'm going to order part from dealer using BMWCCA discount, then use service coupon and have them install it.
Enjoy the new car.