It's not really an ADR since you don't get a specific reservation time, just a 30 minute check in window. And it is a separate FP system from the FP system in MDE (I've never gotten an e-mail or alert about my upcoming FP selections - wouldn't that be a nice option to include?). My experience is that once you set up your account for the BOG FP system, you can continue to log in and make a selection without the e-mail invite or a resort reservation, but only 7 days out. But you need the resort reservation # to set up the account.
Since you've been successful, I would suggest taking a screen shot of your confirmation page - select the View details about your FP+ option and take a screen shot of the resulting page. This way if there is a problem when you check in at the kiosk on the bridge - because NOTHING ever goes wrong with advanced selections - you got some proof to show the CMs that yes, you do have a FP+ for lunch at that time.