I've been forced to delete the certificate in order to be able to log in SCN again. I was getting a message saying I had to activate my email first then upon activating it was asking to confirm my User name used for that email which the email below was greyed out so I tried old one as well as new one without any success as I was receiving the message that this email was already used. I declared forfeit and I removed the certificate and then I've been able to log in again here.
oufff all a story about login