The "Illegal Institution" message is usually caused by your browser blocking third-party cookies.
Clearing the cache in your web browser (Chrome, Edge, Safari) and enabling third party cookies usually solves the issue.
Enable third-party cookies in Chrome
Enable third-party cookies in Safari
iPhone/iPad (iOS 11)
On your iPhone or iPad, go to ‘Settings’
Select ‘Safari’
Under ‘Privacy & Security’, switch off ‘Prevent Cross-Site Tracking’
You may need to restart Safari for the new setting to take effect
We recommend enabling third-party cookies in the settings of your web browser.
On occasion, users are also required to grant specific sites permission to use third party cookies.
To do this: under Allowed to use third-party cookies
Click Add
Copy and paste the terms below into the pop-up box. These allow Leganto and Brightspace to use third-party cookies:
[*.]exlibrisgroup.com
[*.]learn.ul.ie