Some users are facing issues logging in with their Microsoft account

Update timeline

1. identified Mar 04, 2026, 08:12 PM UTC

   We have identified an incident where a subset of users will see error messages when trying to login with their Microsoft account. Upon investigation we discovered that Microsoft seems to be rolling out a set of changed browser headers which are causing issues. We are working on a fix - in the meantime, re-trying to login for a few times seems to solve the issue for most users.

2. resolved Mar 06, 2026, 08:38 AM UTC

   Microsoft seems to have rolled back the change, we'll be monitoring and working on an implementation that works around this new header, should it roll out eventually.