Why This HappensOffice may prompt you to reactivate due to:
A recent Windows update or reinstallation
Signing into Office with a different Microsoft account
A mismatch between the installed Office version and your license
Corrupt or missing activation files
How to Fix ItBefore trying anything else, simply restart your computer.
In many cases, a reboot will reload the activation status and fix the issue instantly.
Go to Control Panel > Programs > Programs and Features
Confirm that the installed version matches your license (e.g., Office 2021 vs Microsoft 365 Apps)
Open any Office app → File > Account
Sign out of all accounts
Close the app, reopen, and check if the message is gone
Go to File > Account > Change Product Key
Enter the same key you received from us
Go to Control Panel > Programs > Microsoft Office > Change > Quick Repair
Try Online Repair if Quick Repair doesn't solve the issueOpen Word or Excel
Go to File > Account
Sign out of any existing Microsoft accounts
Close the app and reopen
Still having issues?Contact us with:
Your order number
A screenshot of the error
Your installed Office version
We’ll help you reactivate your Office or provide a replacement key if needed.