Hi Gacmaska,
I don't know why its not working as I have just been on and it worked ok for me
Maybe it depends where you are in the recruitment process. I mean, have you been for an assessment day recently and not made it through to the end? Maybe its because people have to wait 6 months before applying again, so the system might not let you update for 6 months.
I don't know if this is why and I don't know your situation but it was just a thought.
Hope you get it sorted though x