I heard from a friend that Marriott IT was doing some tinkering/updating & it was going to impact reservations being made Oct 14th-16th. Sounds like the OP might have gotten caught up in that?

Re: the steps Newman takes wrt his reservations, I do similar for ALL hotel chains & have done so for years. It's just good practice/taking ownership/responsibility in the case there is a mix-up - and takes very little of my time to make sure I have a confirmation # & put an email confirmation w/ reservation details into a folder on my computer.

Given we all know IT is a mess right now, I think it prudent that everyone have some kind of back-up rather than 'thinking nothing more of it & assuming it will show up on the app'.

Cheers.