My photos app used to recognize faces, I even added names to recognize and organize faces..but suddenly that feature is not functioning since 6months.. every time when I try to open that feature it is saying check again soon, at that time some photos will also be missing ,it is very frustrating to me..sometimes that feature works once in a bluemoon...i think it's a big bug...i'm using photos app since 8 years..it is my most favorite feature in photos app..please try to fix it