For the GameStop Campaign
First of all, apologies for the delayed reply, but confirming these things usually takes some time. I can confirm that the campaign has now started in its entirety, and as such, codes will also be available from gamestop.de

To recap:
Codes are available in store in Germany, Switzerland and Austria when making a purchase worth at least 19.99 EUR or 24.90 CHF in a brick and mortar GameStop store.

Codes are available from gamestop.de as well. Those will be sent out the following Tuesday. As such, they won't be instantaneous, but you will definitely get them. If you have already made a purchase and not gotten a code, no worries - if you have made the purchase on or after November 22, you will get your code next Tuesday!

Hopefully that clears it up

For the situation in the Netherlands
We are currently looking into this. Please bear with us as we're trying to get a definitive answer.