I found out how to verify that it is being applied.
Go to the "Federal" section.
Hit "Federal Review" at the top,
Get to the "explainwhy(tm)" section
At the bottom, click where it says "How did you calculate the $XYZ of tax I already paid?" (you may have to expand a section to see this, in my case, this was under a heading that said "Your tax payments increased in 2019)
You should get a popup that says "The $XYZ of tax you already paid comes from adding up the $YYY in tax that already came out of your income and the $ZZZ of Social Security tax you overpaid and are getting back."
So, it's extremely confusing and hard to find, but it is in there and does seem to be accounted for.
