This is the correct output. The domain flurry.com is blocked on the default Pi-Hole block lists, so the correct reply is 0.0.0.0 and the matching IPv6 reply for NULL. Pi-Hole is correctly configured for use on this client.
I would try instead to load a domain that is known to have a lot of ads that can be blocked by Pi-Hole. cnn.com is such a domain.
If you do see ads there or on other sites, here are some tools to help find out where the ads are served from.