Activation Problems

Fix Repeated Microsoft 365 Deactivation and Activation Issues

Maira Mehtab Sep 21, 2026 870 views

Question details

Users are experiencing persistent Microsoft 365 deactivation messages and activation failures, even after reinstalling the Microsoft Office suite.

Product: Microsoft 365
Device & OS: Windows
Scenario: Attempting to use Microsoft 365 applications but being repeatedly prompted to activate or seeing a recurring deactivation notice.
Observed behavior: Office repeatedly shows a deactivation message, requiring constant reactivation attempts that fail to persist across sessions.

Before you start

Verify that your Microsoft 365 subscription is currently active on your Microsoft account page and ensure your device is connected to a stable network without restrictive firewalls.

Solution 1Recommended

Clear Stale Office Credentials and Identity Data

Removing old or corrupted account credentials forces Microsoft 365 to fetch a fresh, accurate activation token from the server.

Lingering credential data from previous Office installations or expired subscriptions is a primary cause of activation loops.

Open Credential Manager

Type 'Credential Manager' in the Windows search bar and open the application.

Remove Office Credentials

Click on 'Windows Credentials', locate all entries related to 'MicrosoftOffice', and select 'Remove'.

Open Registry Editor

Press Win + R, type 'regedit', and press Enter to open the Registry Editor.

Delete Identity Key

Navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity, right-click the 'Identity' folder, and select 'Delete'.

Restart and Reactivate

Restart your computer, open any Microsoft 365 application, and sign in to activate.

Registry Backup Warning: Always back up your registry before making changes. Incorrectly modifying the registry can cause system instability.

Solution 2

Roll Back to a Previous Office Update Version

If the activation issue started immediately after a recent Office update, reverting to an older, stable build can resolve the loop.

Solution 3

Perform a Clean Boot and Test a New Admin Profile

Background applications or a corrupted Windows user profile might be interfering with the Office activation service.

Free Microsoft Office alternative

Tired of Microsoft 365 Activation Errors? Try WPS Office

If Microsoft 365 activation issues are continuously disrupting your workflow, WPS Office provides a lightweight, highly compatible, and free alternative. Enjoy seamless document editing without the hassle of subscription loops.

1. Download the Installer: Visit the official WPS Office website and download the free installation package.
2. Install WPS Office: Run the downloaded installer and follow the quick on-screen setup instructions.
3. Open Your Files: Launch WPS Office and open your existing Word, Excel, or PowerPoint documents to continue working immediately.

Fully compatible with Microsoft Office formats (.docx, .xlsx, .pptx).Free to use with a familiar, user-friendly interface.Lightweight installation that doesn't bog down your system.No complicated activation loops or subscription lock-outs.

Frequently Asked Questions

Why does Microsoft 365 keep asking me to activate my subscription?

This usually happens due to corrupted local credential files, multiple conflicting Office versions installed on your device, stale registry keys, or expired subscription statuses.

Will simply reinstalling Microsoft 365 fix the repeated deactivation error?

Not always. If the issue is caused by stale registry keys or lingering account credentials, a standard reinstall will not remove them. You must manually clear the Windows Credential Manager and the Identity registry keys.

Can my network configuration affect Microsoft 365 activation?

Yes, strict firewall rules, VPNs, or proxy settings can block Office from communicating with Microsoft's activation servers, triggering a deactivation prompt or preventing a successful sign-in.

Installation & Activation