Hello JD,
Sorry for the late response.
It seems that email messages to Comcast addresses are being blocked, we already asked them for support, but they have yet to give us a working solution for the problem.
The registration procedure itself is not broken, we receive new registrations and orders all the time.
For the time being you could buy the game also from our partner SimWare (Link can be found in agent Austins posting)
We expect the game to be available on amazon.com within a few weeks. US Stores will not have the game until Q4.