It sounds like you have an email collision between Apple IDs or Apple IDs and Apple Support Communities users.
Do you already have an Apple Support Communities user setup?
Do you have multiple Apple IDs, maybe with the same email linked to them?
If you do have more than one Apple ID sharing the same email, you will want to change the emails so they are unique between IDs.
Thanks for the response. I used to have an old Apple id which was just the prefix of my new Apple id and I was able to log in to the support community with this address and set username.
I cannot sign into the old id as it is not an active address anymore and the new apple id only had a separate me.com address as an associated email address from appleid.apple.com.
I have deleted this associative email address from the list yesterday so I'm not sure where the issue lies.
It is almost as if there is some overlapping remembrence of the old id when I sign in using the new one.
Thanks for the response and let me know if there is anything else that comes to mind.
So it looks like you are successful in logging into Apple Support Communities with two different Apple IDs and users. Where is it you are not able to login with an old account? Do you have yet a third Apple Support Communities user you are trying to access? If so, what is that username?
This problem has been driving me demented. The instructions that Ivan gives have partially worked for me. By following his link
"How to find out if you have multiple Apple IDs" I was able to identify that yes I did have two apple accounts using the same e mail address. One was very old that I used to use for the forum boards and one is my much more recent ID that I use for everything these days. So I changed the e mail address for the old account which is associated with these discussion boards and that's the account that I am now posting this from. However even though the two accounts now have different e mail addresses when I try to log onto the boards with my more recent main apple ID I still get all the same errors as described at the start of this thread by rodgers_j. And of course that's the one I want to use so that I only have one itunes account for everything.
So if anyone has any more hints I'd be very grateful.