Try going to 2degrees.nz and choosing account at the top of the page.  

That's how I have been trying, on multiple devices and connections.

Still just getting a spinning loading icon -  - in the middle of the screen. It was working for me a couple of days ago.

It is working for me on both my laptop and mobile. I get the spinning icon for all of the second and then the page loads with the user name and password boxes. I’d usually suggest clearing your location or the usual things but I assume you’ve done that, especially given you’re getting this on multiple devices. 

I managed to get it working, seems to have been an anomaly with something on my end. I ended up hot spotting to phone after another cache clear and reboot and managed to get it to load. Moved back to the desktop with no change and refreshed again, next thing it's loading there as well.