This offer came with my American Express Platinum card.
Through 6/30/2019, you can earn 2x American Express Membership Rewards points for purchases made using your card ONLINE at Bloomingdales.com
Note, you must first add the offer to your Card and then use the card to shop.
If you have an American Express card that earns Membership Rewards points, you may have this offer available to you as well. Login into your account and check the offers at the bottom of the page.