Apple ID no longer working on discussions.apple.com
To get help with Apple ID, the best solution is to go to this web page to start the process:

http://www.apple.com/support/appleid/

In your case, choose contact support on the lower left of the page. Then Contact US, then iTunes store and finally Apple ID Security.

Explain in detail the error message you got and your email address that is associated with your Apple ID and your Apple ID. Give them a phone number to call you and times that work in the next week and ask for help getting a reset email sent to whatever email account is in use and preventing your participation on Apple Discussions. Explain to them that you want to exert control / secure any and all discussion accounts that are registered to an email account that you control.

You can also choose billing support if you are in any way not able to buy things on the iTunes store or App Stores since they don't need eligible hardware to help people that have problems spending more money without some Apple ID help.

Good luck and feel free to answer with how you sorted this out. I've done so several times in the past, but each time the steps seem to change a bit.