@clancynl Please get in touch with our Izotope support here: https://bit.ly/Izo_support_install
From the auth0 support forum:
"Usually this problem occurs when users bookmark the /login URL that /authorize redirects to and attempt to log in directly. You mentioned signup, was this with a new user or an existing user?"
Try browsing to the website manually and make sure you're using your iZotope username/password. If you're using saved passwords or a password manager they will try to use your Native Instruments username/password.
The problem is Product Portal no longer seems to remember saved passwords since the changeover to NI servers, and annoyingly if you enter your iZotope password in the website user area it constantly tries to overwrite your NI password credentials because it confuses the 2 things. So what I ended up doing is resetting my password to use the same strong password for both sites. Now Product Portal is remembering my saved password again and I don't get clashes between my NI and iZotope logins - essentially it’s like a Unified account now