I cannot write reviews for the app I actually installed.
When I attempted to write a review, it says "You must own this item to write a Customer Review. In order to write a Customer Review for this item you must have purchased or downloaded it."
The app I downloaded and installed does NOT even appear on my "purchased apps" list.
It seems this problem persists for years and years. And Apple fail to fix it.
iPad mini 2 Wi-Fi, iOS 9.1