It has been confirmed that properties may withdraw certain suite/room types from the SNA pool after you've made your choices, leaving you with no checked options. When you look at your reservation online, you will still see this:
We're working on your upgrade.
Your Suite Night request is pending.
However, when you click on MODIFY/CANCEL REQUEST, you will get this warning with no options checked off, and no chance at your SNA ever clearing!
Unfortunately, availability has changed since your last request. The good news is we still have great rooms for you. Please select your favorite ones below.
So make sure you periodically review your SNA choices to make sure your options haven't changed. In my case, two Florence properties (St Regis and Westin) withdrew all but their miniscule suites (377 sq ft) from the SNA pool, none of which I had chosen, so nothing was checked off.
