I recently changed my CC password (best practice, right?) and now the sign up form from my WordPress site doesn't work. Inside WordPress it says "invalid user name", which I did not change, and "invalid password". I changed the password in WP and hit "update", and nothing changed. I know this may be a WP problem rather than an CC problem, but thought I would post here in case anyone else has run into this issue. Thanks in advance.
I apologize for the experience you are having with your WordPress site. You will want to reach out to them to see how to proceed with that error message. Thanks!