I understand, and the other day (Sunday?) I was able to play with the slider and everything worked fine. Today, when I selected Money as the payment option and selected my flights, the Money+Miles option was not there. It was the "regular" payment screen. I also tried this on the mobile app. I even tried clicking on the various advertisements UAL has for Money+Miles, with the same results. Lastly, I tried selecting Miles as the payment option and selected my flights (which is NOT supposed to work), and that didn't provide option either.

So, would appreciate if anyone has gotten it to work today. Else, I'm thinking perhaps it was disabled because they're working on something.