They stopped that; I remember reading about that when it was stopped.
It was great when it existed. I know for a HAL cruise we once got it on both connected cards. And later the offer came up again, and as it was after final payment, I bought $500 OBC and got another $100 credit. (I was at first afraid with other OBC, I would not be able to use it all, but then DW wanted the most expensive Anne of Green Gable tour, and it was easily spent.)