Why can't I sign in with a microsoft account?

[WPCentral Question]

I have a samsung ativ s gtI8750 and when I want to sign in with my microsoft account it says the phone is not activated and requires me an activation code.

 

[Skamath]

Samsung Ativ S - How to activate a Microsoft account on your...

Try this method and if it doesnt Your best bet would be to ask the store/ service provider or MS themselves