Forum Discussion
Issue with sign-in to Office apps after Windows update
We are experiencing sign-in issues with Office apps after the two latest Windows updates: KB5068865 and KB5071417.
When launching Office applications, users receive an Account Error warning. The apps otherwise work as expected, but users must reauthenticate in Outlook to access their mailbox. After signing in, everything works normally. However, the issue reoccurs after a machine restart.
We are running Windows 11 23H2 multi-session in Azure with Citrix DaaS, deployed using MCS. We have also tested upgrading to 25H2 and updating FSLogix, but neither made any difference.
If we uninstall the update, everything works as expected again.
Does anyone have any ideas or has anyone experienced something similar?
2 Replies
Thanks for your input. Do you have any additional details or sources on the Credential Guard changes?
Do we understand correctly that there are no solutions for this at the moment? Are you aware of any upcoming solutions or workarounds?
The Windows updates introduced changes to the Credential Guard / Windows Defender Credential Guard (WDCG) or the Credential Isolation security features. These changes interfere with how FSLogix mounts the user's profile container (the VHDX file), preventing Office apps from consistently accessing the Windows Credential Manager store where authentication tokens are saved. The tokens become inaccessible or are cleared after a logoff/reboot.
