License & Subscription Issues

How to Fix Microsoft 365 License and Local Sign-In Errors

Maira Mehtab Sep 21, 2026 869 views

Question details

The user is experiencing persistent license and local sign-in errors with a personal Microsoft 365 account after removing a corporate account from the laptop.

Product: Microsoft 365
Device & OS: not provided
Scenario: Switching from a corporate Microsoft account to a personal Microsoft 365 account on the same device.
Observed behavior: The system throws license and local sign-in errors for the personal account despite having an active subscription, and a standard reinstallation of Office does not fix the issue.

Before you start

Verify that your personal Microsoft 365 subscription is currently active via your Microsoft account dashboard, and ensure you have administrator privileges on the laptop to modify registry settings safely.

Solution 1Recommended

Clear Office Authentication Cache and Registry Keys

Clearing the OneAuth and IdentityCache folders alongside removing the Office Identity registry key forces Office to reset its authentication state and forget the old corporate account.

When switching from a corporate to a personal account, leftover identity cache or registry tokens can cause persistent sign-in conflicts. Modifying the registry resets this state, allowing clean authentication.

Backup the Registry

Press Win + R, type 'regedit', and hit Enter. Go to File > Export to create a backup of your current registry settings before proceeding.

Clear Authentication Folders

Open File Explorer, navigate to the LocalAppData folder (%localappdata%\Microsoft\Office\16.0), and delete the contents of the OneAuth and IdentityCache folders.

Delete Identity Registry Key

In the Registry Editor, navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity and delete the Identity key. Restart your PC and sign into Office again.

Registry Warning: Carefully follow official Microsoft instructions when modifying the registry, as incorrect changes can cause system instability.

Solution 2

Reinstall Office using Support and Recovery Assistant (SaRA)

Use Microsoft's official SaRA tool to completely scrub remnants of the old corporate installation before reinstalling.

Solution 3

Roll Back the Office Version

If the sign-in issue started immediately after an Office update, reverting to the previous build might bypass the error.

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Frequently Asked Questions

Why does my personal Microsoft 365 account show a license error after removing a work account?

Office often retains authentication tokens and cached credentials from previous work accounts in the IdentityCache folder and registry. This causes conflicts when a new personal account tries to authenticate.

Will a standard uninstallation fix Microsoft 365 sign-in errors?

Usually, a standard uninstallation via the Windows Control Panel does not remove cached identity folders or deep registry keys. You typically need to use the Microsoft Support and Recovery Assistant (SaRA) for a clean wipe.

Is it safe to delete the Office Identity registry key?

Yes, provided you delete the specific key associated with Office identities under the Microsoft\Office structure. It will force Office to prompt for sign-in again, generating a fresh set of keys. Always back up the registry before making any changes.

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