Good to know that this works as well. Apparently, the game Postal 2 included in the bundle seems to be the culprit, or so I have been told.

I just used a VPN and it worked like a charm, so it IS a region-lock issue.

Same here, also from Germany. I hope that is no geolocked issue...

For those who are attempting to redeem the games but keep receiving an error:

Delete the code and manually type it out.

If you're in a country that generally has a problem with NSFW games (like the UK), then use a VPN to redeem the code.

Words to live by, no matter where in the world you live.

Aww, I didn't notice. But that's fine, thanks for letting me know. Maybe next time then. :)

Quoted and reposted.
As for reference, will this suffice?
d.furaffinity.net/art/streifi/...
Thanks for the opportunity and good luck to everybody!