Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello John Closen,
It sounds like Office is detecting a Microsoft 365 license or old activation information instead of your Office Home & Business 2021 purchase.
First, make sure you did not install Office apps from the Mac App Store, as those versions normally require Microsoft 365. Also, sign in to your Microsoft account’s Services & subscriptions page and confirm that Office Home & Business 2021 is listed. If it is, select Install beside the product to reinstall the copy associated with your Office 2021 license.
If Office 2021 is listed but is not recognized, I highly recommend running Microsoft’s License Removal Tool, then restart your Mac and attempt to activate Office again.
Note: The license removal tool only clears saved activation/licensing data on your Mac, it does not delete your purchase or invalidate your license. However, please make sure you still have access to the correct Microsoft account associated with your original Office purchase, as you will need to sign in again to reactivate it after running the tool.
Let me know how it goes!
Please note that support for Office 2021 for Mac ended on October 13, 2026. The apps may continue working, but Microsoft no longer provides security updates, bug fixes, or technical support for this version.