I could not active my word

Redeem the one-time-purchase key through Microsoft’s Office setup website first, then install Word from the Microsoft account to which that license is attached rather than entering the key repeatedly inside Word.

Redeem or locate the license

Since entering the key and signing in within Word already failed, use the browser-based process:

1. Close Word.
2. Open https://www.office.com/setup.
3. Sign in with the Microsoft account that you want permanently associated with Office.
4. Enter the 25-character product key without hyphens if requested.
5. Complete the redemption prompts.
6. Open https://account.microsoft.com/services/office/install using that same account.
7. Confirm that your edition of Office appears, then select Install. After installation, open Word.

A product key is normally redeemed once and then associated with a Microsoft account; that account is subsequently used to install or reinstall Office.^1^

If the website displays an error

• “This product key has already been used”: Do not enter it again. Sign in at https://account.microsoft.com/services with the account originally used to redeem it, and install Office from there.^2^
• INVALID_PRODUCT_KEY or ERR_INVALID_TOKEN: Check that this is an Office key—not the Windows key from a computer label—and check easily confused characters such as B/8, G/6, and O/0.
• KEY_NOT_ACTIVATED: Return to the retailer. Microsoft documents that this means the seller did not activate the key at the point of sale.
• NoMatchingOrEligibleProductsFound or a region message: The key must be redeemed in the country or region where it was purchased.
• The key remains invalid or has been blocked: Contact the seller and request a replacement or refund, particularly if the key was purchased separately from the Office software. Microsoft warns that separately sold keys can be unauthorized or fraudulently obtained.^3^

If the license appears in the account but Word still fails

This points to the installed Office client rather than key redemption. Repair the whole Office installation:

1. Right-click Start and select Installed apps on Windows 11 or Apps and Features on Windows 10.
2. Find the installed Microsoft Office product.
3. Select the three-dot menu or Modify.
4. Select Online Repair → Repair.
5. Restart Windows and open Word again.

Online Repair is the more complete option; Quick Repair only detects and replaces corrupted files.^4^

If the license does not appear under any Microsoft account you control, or redemption still only says “something went wrong,” contact Microsoft Support and provide:

• The exact Office edition: 2024, 2021, or 2019
• The complete error text and code
• Proof of purchase
• The seller’s name
• Only the last five characters of the key—never post the complete key publicly

Note that Microsoft now lists Office 2021 and Office 2019 as out of support, although their product-key troubleshooting information remains available.^1^

References

1. Where to enter your Office product key | Microsoft Support
2. "This product key has already been used" error in Office | Microsoft Support
3. Get help with product key errors on Office.com/setup | Microsoft Support
4. "Something went wrong" error when you try to start a Microsoft 365 app