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Fix Microsoft 365 Family Requesting a Product Key on Another PC
Question details
The user is prompted to enter a product key when trying to use or install Microsoft 365 Family on a secondary computer.
- Product
- Microsoft 365 Family
- Device & OS
- Windows
- Scenario
- Activating or setting up a shared Microsoft 365 Family subscription on another PC.
- Observed behavior
- The Office application unexpectedly requests a 25-character product key instead of activating automatically via the signed-in Microsoft account.
Ensure your computer is connected to the internet and that you have the exact Microsoft account email and password associated with the Microsoft 365 Family subscription ready.
Clear Stored Microsoft Credentials and Re-sign In
Removing old or conflicting Microsoft credentials from Windows forces Office to prompt for a fresh sign-in, resolving account conflicts that trigger the product key prompt.
Microsoft 365 Family relies on your Microsoft account for activation rather than a standalone product key. If Windows has cached credentials from a previous Office installation, a different Microsoft account, or a trial version, it can confuse the activation system. Clearing these credentials is the most effective way to force a clean login.
Ensure that Word, Excel, PowerPoint, and any other Microsoft Office applications are completely closed on your PC.
Click the Windows Start button, type "Credential Manager" in the search bar, and hit Enter to open the utility.
Select "Windows Credentials". Scroll down to the "Generic Credentials" section, find any entries that start with "MicrosoftOffice", click on them, and select "Remove".
Open Microsoft Word. When prompted to activate, choose the option to sign in and enter the Microsoft account credentials associated with your Microsoft 365 Family subscription.
Verify Your Office Installation and Account
Confirm that the correct version of Microsoft 365 is installed on the PC and that no older standalone Office versions are interfering.
Tired of Activation Errors? Switch to WPS Office
If Microsoft 365 activation issues and product key prompts are slowing you down, try WPS Office. It provides a free, lightweight, and hassle-free alternative that works seamlessly with your existing files—no complex subscriptions or product keys required.
- 1. Download the Installer: Visit the official WPS Office website and download the free installer for your PC.
- 2. Install WPS Office: Run the setup file and follow the quick, straightforward on-screen instructions.
- 3. Open Your Files instantly: Launch WPS Office to instantly open, edit, and save your existing Microsoft Word, Excel, and PowerPoint files without any activation prompts.
Frequently Asked Questions
Why does Microsoft 365 ask for a product key when I already have a subscription?
Microsoft 365 is an account-based subscription. If it asks for a product key, it usually means the software is picking up conflicting stored credentials from an old account, or a pre-installed trial version of Office is interfering with your Family subscription.
Do I need a separate product key for each computer using Microsoft 365 Family?
No. Microsoft 365 Family allows you to share the subscription with up to 5 other people. Each person activates Office simply by signing in with their own Microsoft account on their respective PCs, not by entering a product key.
How do I correctly share my Microsoft 365 Family subscription with another PC?
To share your subscription, log into your Microsoft account online, navigate to the Services & subscriptions page, click on Sharing, and send an invitation link or email to the user of the other PC. They must accept the invite and sign in with their own Microsoft account to activate Office.
