Could you please share a screenshot of your location rule? If you want to set the field group to posts in certain categories, I believe you need to set it to “Post Category” “is equal to” “Category Name”. If you want to set it to certain categories, you need to have this rule: “Taxonomy Term” “is equal to” “category”. I’ve attached a screenshot for your reference.
If still no luck, could you please check the developer tool on your browser for any error messages?
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users
Helping others is a great way to earn karma, gain badges and help ACF development!