Originally Posted by
asdfghjk
I can't add the Blue card to my online profile until I receive the card at the end of the month. By that time it would be too late to cancel the Platinum card.
You don't add it. It is an automated process given you are using the same account info when you applied for the Blue Plus. I logged in when I applied and it was automatic added to my Amex card rolodex on Day 1 and the MR account was fully linked on Day 2.