try using a ssid of NZ@McD1
otherwise you may need to do a send/receive on all the MAC addresses you normally visit. Evidently nintendo was trying to crack down on homepass and made it so that attwifi is no longer the ssid associated with the "Nintendo Zone", though attwifi will still work for non-official MAC's like the individual shirt-color ones (again, you may need to visit each and every one before you start getting hits back. Something to do with "old data" or "old outdated data" from 3ds's with version 7 or lower no longer being accepted.)
edit: oh, and it can take up to a day while everyone else is re-seeding their mii to various MAC's.
I change my ssid to NZ@Mcd1 and im getting tags now thanks!