Several months ago, members were able to convert their no pre-set spending limit AAdvantage cards to the the Citi Bronze or Gold AAdvantage cards, which did report a credit limit. However, Citi has since changed the Bronze and Gold versions, and they also have no pre-set spending limits.
I have a Citi Dividend Platinum Select MC. I just called Citi and asked if I could convert the card to an AAdvantage card, and the rep said I could. I then asked her if I was unhappy with the AAdvantage card if I could convert it to a different Citi card, and she replied "yes." She told me that the only problem that I'd have when I converted cards would be that I'd lose the rewards points that I've earned. I'd call back Citi, and ask a different customer service representative about changing your card!
Let us know what happens!