If you've just added a new category in WordPress, you'll likely need to refresh the category options that display when setting up Category Targeting!
Step 1: Head to Grow Publisher Portal > Subscribe > Select a Spotlight or Pop Up form
Step 2: Scroll down to the Targeted Categories section and push the Refresh Categories button:
And that's it! Be sure to do a hard refresh on the page and you should see the additional categories. 🥳