It means you haven't added your actual game key yet. All you've done is register the early access code.

If you ordered a box copy, the key in is the box. If you ordered digital your digital retailer should have given you a new code a couple days ago. If you ordered from the NA SE store, its probably in your spam. If you ordered from there and you can't find it in spam, go to http://findmyorder.com, enter your email and last 5 of cc, and get it directly.