(System error: 0xc004f013) when entering product key.

Strictly speaking, there are no upgrade versions of Office. Getting Office 2021 means to get a new product, if you had Office 2016 before.

Which Office 2021 product did you purchase? From Microsoft or from some retailer?

Hello Bernard,

Thank you for posting in the Microsoft Community.

Please accept our sincere welcome here in the Microsoft Community.

I apologize for the inconvenience you’re experiencing with the activation error. We will try our best to provide helpful information.

Please make sure that

1. Check Your Product Key:
   • Ensure that you’ve entered the correct product key. Double-check for any typos or mistakes.
   • Restart your computer after entering the key to see if the issue persists.
2. Run the Activation Troubleshooter:
   • Press Windows + R to open the Run dialog.
   • Type ms-settings:activation and hit Enter.
   • In the Activation settings window, select Troubleshoot.
   • Follow the prompts to complete the troubleshooter.
3. Verify Your Internet Connection:
   • A faulty internet connection can cause activation errors. Make sure you’re connected to a stable network.
4. Contact the Retailer or Seller:
   • If you purchased a new license, it’s possible that the key has already been used on another device.
   • Reach out to the retailer or seller from whom you obtained the key.
   • If you’re unable to reach them, consider contacting Microsoft Support for further assistance.

Helpful links:

Activate Office after reinstalling or installing on a different device - Microsoft Support

How do I upgrade Office? - Microsoft Support

Hope this will help resolve the issue.

Sincerely,

Ciarra BD.

Microsoft Moderator