SSO error displaying after logging into UDO is linked to your browser settings.
Please try accessing the portal using a Private web page in your browser by clicking the following link:
How to open a private web page.
Log into https://udo.derby.ac.uk/
If you are able to access your portal using a private web page, you will need to clear your browser settings. Click the following link to see the steps for this, you will need to fully close and exit all open web pages before logging back into your account: