[16/03/2021] Microsoft have now confirmed this issue has been resolved.
[15/03/2021, 21:00] We are aware of an issue with Microsoft Azure Active Directory that may be affecting access to some services, including Microsoft Teams and Office.
We are monitoring the status of this incident and will track progress in this announcement.
There is also a live link here to Microsoft's service page.
IT Services Team
Morley College London