Sign-in & Login Problems

How to Fix Cannot Sign In to Microsoft Office or Open Excel

Maira Mehtab Sep 22, 2026 868 views

Question details

The user is unable to sign in to Microsoft Office or launch the Excel application.

Product: Microsoft 365 / Microsoft Office
Device & OS: not provided
Scenario: Attempting to sign in to Microsoft 365 or launch Excel for work or personal use.
Observed behavior: The sign-in process fails or the Excel application does not open, potentially displaying an error message related to licensing, activation, or account issues.

Before you start

Ensure you have a stable internet connection and verify that your Microsoft 365 subscription is currently active before troubleshooting application errors.

Solution 1Recommended

Verify Microsoft Account and Licensing Status

Ensure you are logging in with the correct account associated with your active Microsoft 365 subscription.

Access your Microsoft Account

Navigate to the official Microsoft account portal in your web browser and sign in using the email address linked to your Microsoft Office purchase.

Check subscription status

Click on the 'Services & subscriptions' tab in your account dashboard to confirm your Microsoft 365 license is active and hasn't expired.

Sign in to Office

Open an Office application, navigate to 'File' > 'Account', and sign out of any incorrect accounts, then sign back in using the verified email address.

Solution 2

Repair the Microsoft Office Installation

Use the built-in repair tool to fix corrupted application files that prevent Excel from opening.

Solution 3

Test Other Office Apps and Isolate Add-ins

Isolate the issue by checking if the problem is specific to Excel or affects the entire Office suite.

Free Microsoft Office alternative

Try WPS Office for a Hassle-Free Spreadsheet Experience

If Microsoft Office continues to block your access due to sign-in errors or activation problems, WPS Office offers a free, lightweight alternative. It does not require complex licensing to view and edit your files, allowing you to seamlessly open all your existing Excel spreadsheets and get back to work immediately.

1. Download WPS Office: Visit the official WPS website to download and install the free WPS Office suite.
2. Launch Spreadsheets: Open the WPS Office desktop app and click on the 'Spreadsheets' module.
3. Open existing files: Click 'Open' to browse your local files and seamlessly load your existing Microsoft Excel spreadsheets.

Fully compatible with Microsoft Excel (.xlsx, .xls) and other Office formats.No mandatory online sign-in required to perform basic offline editing.Lightweight installation that runs smoothly even on older devices.Free to use with a familiar, easy-to-navigate tabbed user interface.

microsoft office alternative - wps office

Frequently Asked Questions

Why does Microsoft Office keep asking me to sign in?

This usually happens if your cached login credentials have expired, your password was recently changed, or there is a synchronization issue with Microsoft's servers. Clearing the Windows Credential Manager or signing out and back into Office can often resolve this.

Can I use Excel if my Microsoft 365 subscription has expired?

If your subscription expires, Excel will enter a reduced functionality mode. You will be able to view and print documents, but you cannot create or edit them until you renew your subscription or sign in with an active account.

What should I do if only Excel won't open, but Word works fine?

If the issue is isolated to Excel, it may be caused by a faulty COM add-in or a corrupted personalized setting. Try opening Excel in Safe Mode by holding the CTRL key while clicking the Excel shortcut to bypass these add-ins and troubleshoot the application.

How do I fix the 'Unlicensed Product' error in Microsoft Office?

Ensure you are connected to the internet and signed in with the correct account associated with your purchase. If the issue persists, you can run the official Microsoft Support and Recovery Assistant to automatically diagnose and fix activation errors.

Login & Account Issues