I have the same issue. I have not received my key. Nor can I change my password at Bossland GmbH : Submit a request for assistance So I have no idea why I would not be able to do either of these things.
I have been a very long time user. So let me just tell you in the past, there were issue for sure with this process. Currently, I do not know what the problem is, but I used to be able to use the site link I gave above and get the key myself. This however is not working so I can not retrieve my key.