UPDATE: The issue was, in fact, it not being loaded on the app. It's confusing because the page in the circular says "load these coupons" at the top of the page, then there are a bunch of products shown on a white background with a yellow box under each that says "with digital coupon" and the price. The bottom of the page has a maroon background with Happy Dining and Happy Lady pictured, the terms of the deal, and no mention of digital coupons, and it looks like a completely different section.
I found this out because the store manager called me to apologize, and tell me she spoke to everyone involved. After it happened, I emailed an account of the situation through the S&S website, not thinking I'd get a response any time soon. I have to say, I'm really happy at how quickly it was investigated, and it went a long way to restoring how I feel about the store. The manager told the CS rep that next time she should take care of the customer first and investigate second. There were lots of people there (including the manager) she could have called when she wasn't familiar with an issue, and that I wasn't upset about the deal (I got the $10) but with how it was handled. Apparently, shortly after I left, another customer had basically the same problem, so now the appropriate people have been educated. So, maybe I'll load some of these onto the app, and try again.