Electron + Particle SIM + U260/U270 confusion in AU = unable to activate

So I tried to setup my Electron using setup.particle.io, and entered a non-Particle ICCID, which led me nicely to the ‘Non-Particle SIM Card’ page that allows me to set a custom APN and compile+download a basic Tinker firmware that I expect will at least allow my Electron to connect to the Particle cloud.

After filling the APN text field (Optus uses ‘connect’) I tried clicking on the DOWNLOAD button – nothing happens, no download started. A quick check on the browser’s JS console shows this:

Anyone getting this same issue as well?