Microsoft warns Azure Virtual Desktop users of black screen issues

Microsoft warns Azure Virtual Desktop users of black screen issues

November 1, 2024 at 07:25PM

Microsoft alerted users about potential 30-minute black screens when logging into Azure Virtual Desktop post the KB5040525 Windows 10 update. Users may also face single sign-on failures with Office apps. This issue stems from a deadlock between Azure Active Directory broker and AppX services, particularly affecting FSLogix user profiles.

### Meeting Takeaways

**Issue Overview:**
– Microsoft has informed customers about potential problems following the installation of the KB5040525 Windows 10 July 2024 preview update.
– Users of Azure Virtual Desktop (AVD) may experience login black screens lasting up to 30 minutes.

**Additional Symptoms:**
– Single sign-on (SSO) failures in Office applications (e.g., Outlook, Teams) leading to connection and data sync issues.
– Office apps may lose network connectivity while other applications retain Internet access.

**Technical Explanation:**
– The issue arises from a deadlock between the Azure Active Directory (AAD) broker, the AppX deployment service (AppxSvc), and the Background tasks infrastructure service.
– This is distinct from a previously resolved issue caused by AppxSvc being in an invalid state (addressed in KB5045594 released on October 22, 2024).

**Recommendations and Applicability:**
– The problem is more likely to occur in environments utilizing FSLogix user profile containers, which are common in virtual desktop situations.
– Windows 10 Education edition and home users of Windows Home or Pro editions are not expected to be affected due to lower AVD usage in these environments.

**Background on Azure Virtual Desktop:**
– Azure Virtual Desktop is a cloud-based desktop and app virtualization service enabling access to Windows desktops across various devices.
– Originally launched as ‘Windows Virtual Desktop’ in September 2018, it was rebranded to Azure Virtual Desktop in June 2021, with enhanced security features and pricing options.

### Action Items:
– Monitor updates from Microsoft regarding fixes and further guidance on the black screen issue.
– Assess the impact on users within the organization, particularly those utilizing FSLogix in AVD environments.

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