Windows 11 25H2 Microsoft Graph PowerShell Authentication Popup Not Appearing

Symptoms

• Running Connect-MgGraph or similar cmdlets results in a silent hang or immediate failure
• No interactive authentication window or popup appears for user login
• PowerShell session does not receive access tokens for Microsoft Graph
• No relevant error messages visible in PowerShell console

Likely causes

• Windows Web Account Manager (WAM) service or component malfunction
• Corrupted or missing Microsoft Authentication Library (MSAL) cache or dependencies
• Group Policy or Windows Privacy settings blocking interactive authentication popups
• Conflicting or outdated PowerShell module versions or dependencies

What FixWin checks

• Verify Windows Web Account Manager (WAM) service status is Running
• Check Event Viewer under Applications and Services Logs > Microsoft > Windows > WebAccountManager for related errors
• Confirm Microsoft Graph PowerShell module is updated to latest stable version via PowerShell Gallery
• Review Windows 11 Privacy settings for Account info and App permissions related to authentication popups
• Validate that Group Policy settings under Computer Configuration > Administrative Templates > Windows Components > Windows Hello for Business do not disable interactive sign-in prompts

AI diagnostic workflow

• Run Get-Service -Name WamSvc to confirm Windows Web Account Manager service is running
• Check Event Viewer logs for errors tagged with WebAccountManager or Microsoft Authentication Library (MSAL)
• Use PowerShell command Get-Module Microsoft.Graph -ListAvailable to verify installed module versions
• Temporarily disable privacy settings that restrict app access to account info and retry authentication
• Test authentication on a clean user profile or another Windows 11 25H2 machine to isolate environment factors

Related Windows entities

• Windows Web Account Manager (WamSvc) service
  Handles interactive authentication prompts and token caching for Microsoft identity platform on Windows.
• Microsoft Authentication Library (MSAL) component
  Provides the underlying framework for acquiring tokens and managing authentication flows in Microsoft Graph PowerShell.
• Event Viewer - WebAccountManager Logs log
  Contains diagnostic events related to authentication attempts and failures managed by WAM.
• Microsoft Graph PowerShell Module package
  PowerShell interface for Microsoft Graph APIs; requires proper authentication to function.
• Windows Privacy Settings - Account Info Permissions component
  Controls app permissions to access user account data required for interactive authentication.

Repair logic

If the WAM service is not running or exhibiting errors, restart it and check for system updates. Ensure the Microsoft Graph PowerShell module is up to date to avoid compatibility issues. Review Windows privacy and group policy settings that may block interactive sign-in prompts, adjusting them to allow authentication popups. Analyze Event Viewer logs for specific error codes or warnings to guide targeted remediation. Testing in a clean user profile helps determine if the issue is user environment specific.

FAQ

Why does the Microsoft Graph authentication popup not appear on Windows 11 25H2?

This is often due to the Windows Web Account Manager service being stopped or blocked, corrupted MSAL components, restrictive privacy settings, or outdated PowerShell modules preventing the interactive login window from launching.

How can I check if the Windows Web Account Manager service is running?

Open PowerShell and run Get-Service -Name WamSvc. The status should be 'Running' for authentication popups to work correctly.

Can group policies affect the Microsoft Graph authentication popup?

Yes, policies that disable interactive sign-in prompts or restrict app permissions can prevent the authentication popup from appearing. Review policies under Windows Hello for Business and privacy settings.

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