Product Key Issues

Fix Office 2021 Claim Service Unavailable Error in Microsoft Store

Rana Garcia Oct 16, 2026 869 views

Question details

The user is trying to claim their pre-installed copy of Microsoft Office Home and Student 2021 from the Microsoft Store, but clicking the 'Claim' button results in a 'Service Unavailable' error.

How to Fix Office Home and Student 2021 Claim 'Service Unavailable' Error

Product: Office Home and Student 2021
Device & OS: Windows PC
Scenario: Claiming a digital entitlement for pre-installed Office software on a newly purchased computer.
Observed behavior: The Microsoft Store displays a 'Service Unavailable' error when the user clicks 'Claim', and resetting the Store cache does not bypass the error.

Before you start

Ensure you have a stable internet connection and that you are signed into the Microsoft Store with the Microsoft account you intend to link to your Office 2021 license.

Solution 1Recommended

Reset Microsoft Store Cache and Verify Date/Time

Corrupted Store cache or incorrect system time can block communication with Microsoft's activation servers.

Even if you have tried resetting the cache before, it is important to follow the reset with a date and time synchronization to ensure the Store can properly authenticate your digital entitlement.

Run the WSReset command

Press the Windows key, type 'wsreset.exe' in the search bar, and press Enter. A blank command prompt window will appear and close automatically after a few seconds.

Verify Windows Date and Time

Right-click the clock in your Windows taskbar and select 'Adjust date/time'. Ensure that 'Set time automatically' and 'Set time zone automatically' are both toggled on. Click 'Sync now' to force an update.

Sign in to the Microsoft Store

Open the Microsoft Store app, click your profile icon at the top, sign out, and then sign back in with your Microsoft account.

Attempt to claim Office again

Navigate to 'Library' > 'Included with device' in the Microsoft Store and click the 'Claim' button next to Office Home and Student 2021.

Reset Microsoft Store Cache and Verify Date/Time

Microsoft Server Outages: If the error persists immediately after these steps, there may be a temporary outage with Microsoft's activation servers. Wait a few hours and try again.

Solution 2

Request a Product Key from Your PC Vendor

If digital entitlement fails permanently, you will need a traditional product key to activate your software.

Free Microsoft Office alternative

Use WPS Office as a Free, Lightweight Alternative

If you are unable to claim your Microsoft Office license due to server errors, consider using WPS Office. It is a powerful, free alternative that lets you create, edit, and save documents, spreadsheets, and presentations immediately without complex activation processes.

Fully compatible with Microsoft Office formats, including DOCX, XLSX, and PPTX.Completely free to use with no frustrating activation or store claim errors.Lightweight design that installs in seconds and runs smoothly on any Windows PC.Familiar user interface that makes switching from Microsoft Office seamless.

microsoft office alternative - wps office

Frequently Asked Questions

Why does the Microsoft Store say 'Service Unavailable' when I try to claim Office?

This error is typically caused by corrupted temporary files in the Microsoft Store app, incorrect system date and time settings preventing secure connections, or a temporary outage on Microsoft's entitlement servers.

Can I download Office from my browser if the Microsoft Store claim fails?

If your license was already successfully linked to your Microsoft account before the error appeared, you can log in to setup.office.com or your Microsoft account dashboard (Services & subscriptions) to download the installer directly, bypassing the Microsoft Store.

Where can I find the product key for pre-installed Office 2021?

Modern Windows PCs use a 'Digital Entitlement' system, meaning no physical product key is provided. The license is embedded in the hardware. If the digital claim fails, you must contact the PC manufacturer or retailer to obtain a manual replacement key.

Installation & Activation