Nostalrius Begins - Quality wow vanilla realm (1.12)

When I try to register, I get:

Registration failed! This username is already taken.

But if I try to log in with my normal info, I get:

Login failed! Bad credentials.

Are the two forum sites linked? Were accounts and login info transferred over from the old site? If so, why can I get on the old forum site, but not the new one?

How can I get this fixed?

Bump still no reply for this issue.

I don't want to have to create a new email just so I can create an acct on the new web site. I'd like to be able to use this same account.

So far I can't do that.

Will I have to make a new email to be able to get on the new forum site?