Activation Problems

How to Fix Microsoft 365 Account Error and Unlicensed Product Message

Maira Mehtab Sep 20, 2026 868 views

Question details

The user encounters account errors and an Unlicensed Product message when using Office applications, despite having an active Microsoft 365 Personal subscription.

Product: Microsoft 365 Personal
Device & OS: Windows
Scenario: Opening and attempting to use Microsoft Office applications while logged into a valid active subscription account.
Observed behavior: Office applications display Account Error and Unlicensed Product messages, preventing normal use of the software.

Before you start

Before proceeding, ensure all Microsoft Office applications are completely closed and create a backup of your Windows registry if you plan to modify it.

Solution 1Recommended

Clear Office Identity Cache and Registry Keys

This is the most effective solution. Removing corrupted cached identity files and registry keys forces Office to fetch fresh activation data from your active subscription.

Often, Microsoft 365 retains old or corrupted login session data. Deleting the OneAuth and IdentityCache folders, along with the Office Identity registry key, resets this connection without deleting your actual documents.

Delete cached identity folders

Press the Windows Key + R, type '%localappdata%\Microsoft\Office\16.0' in the Run dialog, and press Enter. Locate and delete the 'OneAuth' and 'IdentityCache' folders.

Open the Registry Editor

Click the Windows Start menu, type 'regedit', and select Registry Editor from the search results to open it.

Remove the Office Identity key

Navigate to 'HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity'. Right-click the 'Identity' folder, select Export to back it up, and then delete it.

Restart and sign in

Restart your computer. Open Microsoft Word or Excel, and follow the on-screen prompts to sign back into your Microsoft 365 account.

Registry Backup Caution: Modifying the Windows Registry can cause system issues if done incorrectly. Always right-click and 'Export' a registry key to create a backup file before deleting it.

Solution 2

Reinstall Microsoft 365 Using an Offline Installer

If clearing the cache and registry does not resolve the licensing issue, the Office installation files might be heavily corrupted.

Solution 3

Roll Back Office to a Previous Version

Use this method if the Unlicensed Product error started occurring immediately after a recent Microsoft Office automatic update.

Free Microsoft Office alternative

Try WPS Office to Avoid Activation Hassles

If you are tired of dealing with Microsoft 365 activation errors, account lockouts, and persistent Unlicensed Product messages, consider switching to WPS Office. It provides a highly compatible, easy-to-use alternative that meets your daily document needs without complex licensing hurdles.

1. Download WPS Office: Visit the official WPS website and click on the 'Download WPS Office Free' button to get the installer.
2. Install the Software: Run the downloaded installer file and follow the straightforward on-screen instructions to set up the software.
3. Open Your Office Files: Launch WPS Office and instantly open your existing Word, Excel, and PowerPoint documents without worrying about subscription validation.

Completely free for basic daily document creation and editing.Fully compatible with Microsoft Office formats, including .docx, .xlsx, and .pptx.Lightweight installation that does not consume excessive system resources.No frustrating activation loops or unexpected 'Unlicensed Product' interruptions.

microsoft office alternative - wps office

Frequently Asked Questions

Why does Microsoft 365 display an Unlicensed Product message when I have an active subscription?

This error typically occurs due to corrupted local identity cache files, network synchronization delays, or outdated login session data that prevents the software from properly verifying your subscription status with Microsoft servers.

Will deleting the IdentityCache folder delete my personal documents?

No. Deleting the IdentityCache and OneAuth folders only removes temporary login and activation session data. Your Word documents, Excel spreadsheets, and other personal files remain completely safe.

What should I do if the registry fix doesn't remove the account error?

If clearing the registry and cache doesn't fix the issue, you should try repairing your Office installation via the Windows Control Panel, or completely uninstall and reinstall the software using the Microsoft 365 offline installer.

Can I use WPS Office to edit files created in Microsoft 365?

Yes, WPS Office is highly compatible with Microsoft Office formats. You can seamlessly open, edit, and save your existing .docx, .xlsx, and .pptx files using WPS Office.

Installation & Activation