Redeem the pre-order code here - http://tomclancy-thedivision.ubi.com/game/en-GB/beta/index.aspx (scroll down to "Enter your code here").

We'll be sending out the full game code a few days before launch, not sure exact time yet. Everyone that has the pre-order code or has played in a beta will be getting the Hazmat Gear content.

@CopyCatDk1, it's possible your browser might be causing issues with you trying to connect it via steam. Are you doing it via your account page?