Your certification should be associated with your email address, not a specific portal. If you create a new account with your email address, you should see the certificate.
Alternatively, if you would like your portal restored, can you please share your portal ID with me?
Well, I did create a new account with the same email address (otherwise I wouldn't be able to write this message) and I don't see the certificate anywhere. This says no course is completed: http://prntscr.com/lt9iso Maybe I'm looking in the wrong place?
I still have the email that says I did pass the exam (http://prntscr.com/lt9jnq) The account that had the certificate was this: