Without being able to search by my unique identifier (i.e. my profile is facebook.com/IDENTIFER) because there are more than ten people with my name this tool is useless. Shame.
However, I'm not sure if it's because my account was created at end of June 2019 that it didn't return anything, or if it didn't work. (it worked when I pulled up a couple of the big name user's id's and compared to the breach.