It's what I did at the time, and I did it again now, but it doesn't work. I can change password as many times as I want, but the account is still blocked for no reason.
So you didn't get to the big contact form? Did you select the same things I did? I just tried it again on another account, and got the same page as before.
Try with https://account.live.com/acsr it's the page it eventually sends me to for the recovery.