When setting up the Bill Reminder for my newest credit card (a retail store Master Card at Comenity.net) does not show the option to have Quicken estimate the bill by using the current credit card balance. All my other cards are set up that way. It only shows "Fixed Amount", "Previous Payments" and "Time of Year", none of which are appropriate for a credit card.
I am on Quicken Classic Deluxe Build 27.1.56.13. The "account details" tabs seem to be set up exactly like my other credit cards, including Express Web Connect for downloading transactions.