We've identified the root cause of the issue and are working to resolve it. This has been caused by an internal configuration issue.
At the time of writing we are aware of the following known issues:
-Directory - display names misconfigured
-MyTimetable - display names misconfigured, attendance list unavailable, email list unavailable
-MyUoY app- display name misconfigured
We will continue to update this list. If you have any concerns about other systems please contact IT Support