Microsoft Services Login 404 and Dialog Crashes on Windows 11 Home

Question

I cannot sign into any Microsoft services on my main profile! Whenever I click a login prompt or a Windows account dialog, the window either crashes immediately or displays "HTTP 404" for login.microsoftonline.com. This has been happening for quite a long time.

I cannot activate any office product, use the microsoft store, or do anything.

System:

• Windows 11 Home, Version 25H2 (Build 26200.7840).
• Affected: Microsoft Office 365, Microsoft Store, and all Windows Account dialogs.
• Specific to one profile. This is a local profile, but I am not even able to log in to switch to a microsoft one. A newly created local profile on the same machine works perfectly.

Ive already:

• Performed a full Windows 11 repair install using a fresh ISO while keeping files and apps. The issue persisted immediately after the refresh.
• tried DISM /RestoreHealth and SFC /Scannow. DISM failed due to a version mismatch between the tool (26100) and the image (26200).
• Tried re-registering Microsoft.AAD.BrokerPlugin via PowerShell, but received "Access Denied" even as Administrator.
• Manually cleared IdentityCache and OneAuth folders in AppData\Local\Microsoft.
• Attempted to force authentication by adding EnableADAL and DisableAADWAM DWORDs in the registry.
• Reinstalled the WAM Plug-ins

Because a new profile works, the Windows system files are probably OK. I have no idea what is going on and other solutions ive found arent working or outdated.

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Moved from Microsoft 365 and Office | Office Online Server

Answer 1

Hello stronggeologywalk,

It's good to hear that everything is good now.

Feel free to let me know if you have any other questions.

Answer 2

After a long investigation I realized my system had a proxy I was forcibly connecting myself to via an application.

This proxy somehow prevented me from using microsoft services. Everything started working when I cleared it.

Answer 3

After a long investigation I realized my system had a proxy I was forcibly connecting myself to via an application.

This proxy somehow prevented me from using microsoft services. Everything started working when I cleared it.

Answer 4

Hello stronggeologywalk,

Welcome to Microsoft Q&A forum.

I see that you are having problem with your login screen on one profile. Usually, that means the current profile is corrupted and the best way going forward is to move your data to the new profile and remove the old one. However, here is a few fix you can try before doing so.

• Repair/Reinstall Edge Runtime Webview2.
  1. Go to Settings > Apps > Installed Apps to check if Webview2 is there. If so, uninstall it.
  2. Download Webview2 using this official link.
  3. Run the file as an administrator to configure one per-machine installation. If it says it is installed, you can uninstall it using this command. winget uninstall --id Microsoft.EdgeWebView2Runtime -e -h
• Clear the old Web Account Manager token
  1. In Credential Manager, navigate to Windows Credentials.
  2. Removed all entries mentioning ADAL, WAM, MSOffice, Microsoft Office, Teams, aad, login.microsoftonline.com.
  3. Open the command prompt and enter these commands one by one.
     • rmdir /s /q "%LOCALAPPDATA%\Packages\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\AC\TokenBroker\Accounts"
     • rmdir /s /q "%LOCALAPPDATA%\Packages\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\AC\TokenBroker\Cache"
     • rmdir /s /q "%LOCALAPPDATA%\Microsoft\IdentityCache"
  4. Restart your computer and try again.

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Answer 5

It sounds like you're experiencing a challenging issue with your Microsoft services login on your main profile. Since you've already tried several troubleshooting steps, here are a few additional recommendations that might help resolve the problem:

1. Reinstall WAM Plug-ins: Since you mentioned issues with Microsoft.AAD.BrokerPlugin, try reinstalling the WAM plug-ins. You can do this by running the following PowerShell commands:

      Add-AppxPackage -Register "$env:windir\SystemApps\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\Appxmanifest.xml" -DisableDevelopmentMode -ForceApplicationShutdown
      Add-AppxPackage -Register "$env:windir\SystemApps\Microsoft.Windows.CloudExperienceHost_cw5n1h2txyewy\Appxmanifest.xml" -DisableDevelopmentMode -ForceApplicationShutdown
   

   Make sure to run PowerShell as an administrator to avoid "Access Denied" errors.
2. Check Security Software: Sometimes, security software can interfere with the sign-in process. Temporarily uninstall any security software and see if that resolves the issue. If it does, consider configuring exclusions for the WAM plug-ins in your security software.
3. Reset Internet Explorer Settings: Since Microsoft services often rely on Internet Explorer settings, resetting them might help. You can do this by going to Internet Options > Advanced > Reset.
4. Create a New Local Profile: Since you mentioned that a newly created local profile works perfectly, consider migrating your data to this new profile as a last resort. This could help you bypass the issues tied to your original profile.
5. Contact Microsoft Support: If the problem persists after trying these steps, it may be beneficial to contact Microsoft Support for further assistance, especially since the issue affects multiple services.

Monitor the situation after trying these steps to see if the issue resolves.

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References:

• Can't sign in to Microsoft 365 desktop applications
• Repair a Windows Image