Further to this, I think they are blocking signups from Flick customers
If I type 2 known Flick addresses into the checker, they both come up with this message,
If I try any other random address in the same area, it allows you to continue signup
skewt: My friend tried to sign up with my code but got this message, anyone else had this?
Area was: Dunedin, she was attempting to move from Flick
Maybe they are currently struggling with demand from flick customers