Fix Office 365 Product Deactivated Error Without a Product Key on Windows

Yesterday I changed the password for my Microsoft Office 365 account whilst I had some documents open from One Drive. I can still sign into Office 365 online, however each time I try to open any Word, Excel, Teams, Outlook software directly from my laptop (not browser) I see a message stating 'Product Deactivated - features are changing from 24th August - Reactivate Option'. I have tried the option to reactivate by signing in

Understanding the Activation Loop & Error Code 29

Use the same platform and signed-in context described here before continuing: Press Win + I to open Windows Settings , then navigate to Accounts > Other users (or Family & other users)

Creating a New Windows User Profile

The steps below target Office 365 Product Deactivated Error Without a Product Key on Windows and use Accounts > Other users pane as the visible reference point.

1. Press Win + I to open Windows Settings , then navigate to Accounts > Other users (or Family & other users)
2. Click the Add account button under the "Other users" section
3. On the Microsoft sign-in window, click I don't have this person's sign-in information
4. On the next screen, select Add a user without a Microsoft account to create a local profile
5. Enter a new username (e.g., "NewAdmin") and password, then click Next
6. Click on the newly created profile, select Change account type , set it to Administrator , and click OK
7. Sign out of your current Windows profile, log into the new one, and launch Excel or Word. Sign in with your Microsoft 365 credentials to verify the error is gone

Alternative Solution: Clearing Corrupted Windows Credentials

• Close all Office applications. Click the Windows Start menu, type Credential Manager , and press Enter.
• Click on Windows Credentials .
• Scroll down to the Generic Credentials section.
• Click the drop-down arrow next to every entry containing MicrosoftOffice16 or MicrosoftAccount , and select Remove .
• Restart the PC, open Word, and sign in again to generate fresh authentication tokens.

How to Verify the Microsoft 365 Result

Run the final check exactly as described: Sign out of your current Windows profile, log into the new one, and launch Excel or Word. Sign in with your Microsoft 365 credentials to verify the error is gone If it fails, return to Accounts > Other users pane and confirm that The "Add account" button was applied to the intended item.

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Microsoft 365 FAQs About Office 365 Product Deactivated Error Without a Product Key on Windows

How do I fix Office 365 Error Code 29 without a product key?

Error 29 is an account synchronization issue, not a licensing issue. You do not need a product key. You can fix it by creating a new Administrator user profile in Windows Settings, logging into that new profile, and signing back into your Microsoft account through any Office application.

Why does Office say "Product Deactivated" after I changed my password?

When you change your password while Office applications or OneDrive are running, the cached login tokens on your computer become mismatched with Microsoft's servers. This forces a deactivated state because the local software can no longer verify your active subscription status.

Where do I find the product key for a Microsoft 365 Home subscription?

Microsoft 365 subscriptions do not use 25-character product keys for reactivation. Your license is digitally attached to the email address used to purchase the subscription. Reactivation simply requires signing in with the correct email and password.

Will clearing the Credential Manager delete my Office documents?

No, removing entries in the Windows Credential Manager only deletes saved passwords and authentication tokens. Your local files, OneDrive documents, and application settings remain completely untouched. It simply forces Office to ask for your password again.