I have a new computer and need to activate my purchased Microsoft Office Home.

For Office Home, the product key is normally used only once to redeem the purchase to the Microsoft account that was used during setup. After that, the key is no longer needed for reinstalling or activating on that same account.

If the key page keeps looping, use this path instead:

1. Go to the Microsoft account, Services & subscriptions page.
2. Sign in with the same Microsoft account that was used when Office Home was first redeemed.
3. If Office Home appears there, select Install.
4. After installation, open an Office app and sign in with that same Microsoft account to activate it.

If the product key page says the key has already been used, that means it has already been redeemed and should not be entered again. Installation should be done from the Microsoft account instead.

For a one-time purchase such as Office Home, it is licensed for one computer at a time. If moving it to a different computer under the transfer terms, Office must be uninstalled from the original computer. If activation still fails on the new computer, phone activation or Microsoft support may be required.

If direct phone or chat has not been available, use the Get Help app in Windows and choose Contact support / Chat with an agent to reach support options.

• Where to enter your Office product key | Microsoft Support
• Using product keys with Microsoft 365 | Microsoft Support
• Activate Office after reinstalling or installing on a different device | Microsoft Support
• How do I get microsoft office on my new computer if i already have account? - Microsoft Q&A
• Transferring product key to new computer - Microsoft Q&A