Activation Problems

Fix Microsoft 365 Unlicensed Product Error After Windows Upgrade

Emma Brown Sep 29, 2026 869 views

Question details

The user needs to resolve an Unlicensed Product error in Microsoft 365 that occurs after upgrading their Windows operating system, despite having an active subscription.

How to Fix the Microsoft 365 Unlicensed Product Error After a Windows Upgrade

Product: Microsoft 365
Device & OS: Windows
Scenario: Attempting to use Microsoft 365 applications after completing a Windows OS upgrade.
Observed behavior: Microsoft 365 displays an Unlicensed Product message and fails to authenticate, blocking access to full features even though the user's subscription is active.

Before you start

Before troubleshooting, log into your Microsoft account dashboard online to verify that your Microsoft 365 subscription is currently active and note the exact email address linked to it.

Solution 1Recommended

Clear Cached Office Credentials and Disconnect Old Accounts

Removing outdated or corrupted credentials from the Windows Credential Manager is often the quickest way to force Microsoft 365 to authenticate properly.

Open Windows Credential Manager

Click the Windows Start button, type 'Credential Manager' into the search bar, and press Enter to open the application.

Remove Office Credentials

Select 'Windows Credentials'. Scroll through the list to find any entries containing 'MicrosoftOffice16'. Click on each one and select 'Remove'.

Disconnect Old Work or School Accounts

Go to Windows Settings > Accounts > Access work or school. If you see any old or incorrect accounts listed, click on them and select 'Disconnect'.

Restart and Sign In

Restart your computer, launch any Microsoft 365 app like Word or Excel, and sign in again with your active subscription credentials.

Clear Cached Office Credentials and Disconnect Old Accounts

Account Verification: If your account belongs to an organization, you may need to contact your Microsoft 365 IT administrator if the sign-in still fails after clearing credentials.

Solution 2

Reset Microsoft 365 Activation Data

If clearing credentials fails, the Office identity information in your system may be damaged and requires a manual reset.

Solution 3

Uninstall and Reinstall Microsoft 365

If the error persists after resetting credentials and activation data, a clean installation of Microsoft 365 will rebuild all necessary licensing files.

Free Microsoft Office alternative

Switch to WPS Office to Avoid Activation Headaches

Tired of dealing with Microsoft 365 licensing errors and subscription issues after system updates? WPS Office is a free, lightweight, and highly compatible alternative that lets you view, create, and edit your documents without the hassle of complex activations.

1. Download the Free Installer: Visit the official WPS Office website and download the free installation package for Windows.
2. Install WPS Office: Run the setup file and follow the quick on-screen instructions to install the software on your device in minutes.
3. Open Your Existing Files: Launch WPS Office and directly open your existing Word, Excel, or PowerPoint files with seamless formatting retention.

Fully compatible with Microsoft Office formats including .docx, .xlsx, and .pptxFree to use with a familiar, easy-to-learn interfaceLightweight installation that doesn't slow down your PCNo complex activation servers or recurring Unlicensed Product errors

microsoft office alternative - wps office

Frequently Asked Questions

Why does Microsoft 365 say Unlicensed Product when my subscription is active?

This usually happens due to cached outdated credentials in the Windows Credential Manager, corrupted activation data after a Windows upgrade, or accidentally signing in with a different Microsoft account that doesn't have an active subscription attached.

Will uninstalling Microsoft 365 to fix this error delete my files?

No, uninstalling Microsoft 365 only removes the application files from your computer. Your personal documents, spreadsheets, and presentations will remain safely on your hard drive or in your OneDrive cloud storage.

How do I check which account is associated with my Microsoft 365 subscription?

You can log into your Microsoft account dashboard online via a web browser and navigate to the 'Services & subscriptions' tab. This page will display which products are currently active and linked to your specific email address.

Installation & Activation