The current Webauth login page where you sign in with your SSO is going to be replaced with an Oxford-branded Microsoft login page on 10 November. (1/2)
If you've not already done so, you can set up OneDrive in just a few minutes to make sure your work is synchronised to the cloud (and it's free for students!). https://it.brasenose.org/help/how-to-set-up-onedrive/