Update: This issue has been resolved as of 8:30pm Sep 28.
Microsoft is experiencing a problem with their authentication system that is preventing users from logging into major University systems. Microsoft is working to resolve the problem.
Systems affected include Blackboard, Office 365, UWinsite, myuwinfo and Linked In Learning. Other systems that share the same authentication system will also be affected.
Blackboard users can log in using the button labelled "Alternate Sign-In Method" below the main Sign in button.
Update Sep 29 8:20am: Authentication gradually began working again between 8:00 and 8:30pm on Sep 28. We do not yet have details on the cause of the issue.