I think the problem is you need to setup via email before PM will mail you the sim. These information remained in cache memory and unless you clear it, it rejected you from continuing the subscription process. You will be able to continue once you cl...
I had the same issue. I tried many times and it kept on going back to the login page. I finally resolved it by clearing my browsing history (I am using Chrome) and it finally allows me to continue with entering the SIM information and activate my pho...