I used to use it frequently especially with business trips so I could review the folio and make sure its all correct, and also have one that shows zero/paid balance. As mentioned above, it used to actually check you out and send a copy of the current bill almost immediately. More often then not, if I just leave the hotel I never actually get sent a copy of the folio without having to send an email a couple days later to ask.

Anyway - not why this is/was so difficult for Marriott to manage and keep working... but thats just another example of their abysmal outsourced IT that doesn't test stuff. I'd send in a complaint and report that its broken, but there is no way to actually report app or website functionality issues and get any sort of useful response.