Have you tried visiting the url provided in the voucher itself?

If you already have a voucher you can add that in the checkout section when you buy something from the Samsung website

You need to be a Samsung employee first. So yeah get a job at Samsung

That's not for general users. It's mostly for Samsung employees or if you get a special code/voucher from Samsung itself.

That's not an issue. It's just the display adjusting to the ambient light around you. I believe that's intended in the always on display. If you don't believe it then try blocking the light sensor which is around the camera area or try blowing flashl...