Unable to use Black Friday Special discount

Hi !

I want to buy a 100$ gift card, billed and shipped to Canada.
When I get to the Promo & Discount page, I add the "tdzmu" code and click "Apply Discount" but nothing happens.
The button is not greyed, the discount is not added.. I can click is as much as I want, it doesn't change anything.

Is this supposed to work for Canadian residents? Gift cards?

Thanks !

EDIT: Still no update and Black Friday is only today..
I wish this issue could at the very least be acknowledged. This has been a pretty disappointing experience.

I'm so sorry Guisim - you can not apply discounts to Gift Cards:
https://www.shapeways.com/blog/archives/1784-Free-Worldwide-S hipping-or-20%25-Discount-on-3D-Printing-over-75.html