As most of us are aware, Citibank has a program called Merchant Offers, whereby you can enroll certain Citibank credit cards for additional cashback when used with certain merchants.
This showed up as a Merchant Offer for many of my Citibank credit cards, including two AAdvantage Mastercards. I enrolled both cards.
Weirdly, however, I discovered that when I enrolled the second card in the Giftcards.com Merchant Offer, the first card became unenrolled from the Merchant Offer. It did not fully disappear from the list of available Merchant Offers (like happens with Amex Offers), but it just changed status from enrolled to unenrolled.
I am not sure if this is intentional or a glitch, but I think that every time you plan to use an enrolled Merchant Offer, you should go on the Citibank website to make sure that the enrollment is active (or to reactivate it if it has become unenrolled).
Have you experienced this or similar phenomena with Citibank Merchant Offers?