If the device includes Office Home 2024, the license is typically claimed through the preinstalled Office app and then tied to the Microsoft account used during redemption.
Try this path:
- Open a preinstalled Office app such as Word, Excel, or PowerPoint.
- If a trial or expired Microsoft 365 message appears, select No, thanks.
- In the app, go to File > Account.
- If Product Information shows the apps are unlicensed or the subscription expired, return to the document window.
- Open a blank document. Look for the yellow notification bar that offers to claim Office Home and Business 2024 and select Claim.
- In the Use the Office Home and Business for free right now dialog, select Claim in the left box.
- The Microsoft Store order flow should open. Sign in with the Microsoft account that will own the license.
- If the product page shows Free (including tax), select Get.
- On the cart page, confirm the total is ¥0 and complete the order.
- On the Thank you for your order page, a product key is provided.
- Return to the Office app dialog from step 5.
- Select Activate in the right box.
- In Enter a product key, enter the saved key exactly and select Activate Office.
- If prompted, sign in with the same Microsoft account.
- Accept the Microsoft Services Agreement and confirm the product redemption.
- When activation finishes, select Get started, then accept the Office license agreement.
- Go back to File > Account and verify Product Information shows Microsoft Office Home and Business 2024.
- Also check https://account.microsoft.com/services and confirm Microsoft Office Home and Business 2024 appears under Products you've purchased.
If clicking Claim only opens Word and Word asks to buy Office or enter a product key, use the in-app claim flow above rather than the buy screen. The product key is generated during the free order process on the Thank you for your order page.
If the Microsoft Store page does not show Free (including tax) after signing in with the intended Microsoft account, contact Microsoft support.
If the key was already redeemed and Office later asks for a key again, do not enter a new key. Sign in with the same Microsoft account at account.microsoft.com and install or activate Office from the account instead.