Black Ops 3 discount code not working

Hi,

I received an email on Jan. 30th about a special offer to purchase either the standard or digital deluxe edition of Black Ops 3 at 25% off. Today when I went to go purchase the standard edition on the store and entered the discount code at the checkout, it said it had already expired. However, according to the email, it says that the offer is valid until "11:59 pm PT on Feb. 8th 2016."
If someone could respond and clear this up that would be greatly appreciated.