Missing Stay Page Doesn't Work
 

Posting this here in the hopes that somebody will see it and fix the problem. The missing stay form on the Marriott Web site and app aren't working. It's not possible to actually select a date for check in on the page. Clicking on a date does nothing. I've tried both the app and the web site and neither work.

Sounds like it works just like Marriott wants.

Are you sure you’re not trying to select a date within 10 days back from now ?

These are locked out, because they want to make you wait 10 days before you can submit your request. Selecting a date more than 10 days ago is working fine for me.