Sign-in & Login Problems

How to Fix Sign-In Errors in Outlook, OneDrive, and Microsoft Apps

Tauseeq Magsi Oct 1, 2026 869 views

Question details

Users are unable to sign into multiple Microsoft applications, including Outlook and OneDrive, due to persistent sign-in errors.

Microsoft Office Create account or Sign In

Product: Microsoft Office
Device & OS: Windows
Scenario: Attempting to log into or sync data across multiple Microsoft applications.
Observed behavior: Applications immediately display sign-in errors upon launch, preventing access to connected services, emails, and cloud storage.

Before you start

Ensure you have administrator privileges on your Windows PC, as you will need to access Windows Services and modify application settings to resolve this issue.

Solution 1Recommended

Enable the Microsoft Account Sign-in Assistant Service

Restarting or enabling the 'wlidsvc' service restores the system's ability to authenticate Microsoft accounts across all applications.

The Microsoft Account Sign-in Assistant (wlidsvc) is a background service in Windows responsible for user authentication. If it gets disabled by system optimization tools or updates, Microsoft apps will fail to sign in.

Open Windows Services

Press the Windows key + R to open the Run dialog, type 'services.msc', and press Enter.

Locate the service

Scroll down the list of services and find 'Microsoft Account Sign-in Assistant' (wlidsvc).

Change startup type

Right-click the service and select 'Properties'. In the General tab, change the Startup type drop-down menu to 'Automatic'.

Start the service

Click the 'Start' button under Service status, then click 'Apply' and 'OK' to save your changes.

Service Restored: Once the service is running, restart your computer to ensure the authentication changes take effect across all Microsoft applications.

Solution 2

Run Microsoft Office Quick Repair

If the sign-in service is running properly but errors persist, the Microsoft Office installation itself may be corrupted and requires a repair.

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Frequently Asked Questions

Why does my Microsoft Account Sign-in Assistant keep turning off?

This service can be inadvertently disabled by third-party system optimization software, aggressive antivirus programs, or following a major Windows system update. Setting its startup type to 'Automatic' usually prevents it from stopping.

Will an Office Quick Repair delete my files or emails?

No, running a Quick Repair only replaces corrupted application program files and fixes registry keys. It will not delete your personal documents, OneDrive files, or Outlook data files.

What should I do if the wlidsvc service is missing from Windows Services?

If the Microsoft Account Sign-in Assistant service is entirely missing, your Windows installation may be corrupted. You may need to run the System File Checker (sfc /scannow) in Command Prompt as an administrator or contact Microsoft Support for further diagnostics.

Login & Account Issues