When you activate Office or enter your product key, you might receive an error message that your product key has been blocked. This means that your Office product key will no longer work.
If your Office product key doesn't work, or has stopped working, you should contact the seller and request a refund. If you bought a product key separate from the software, it's very possible the product key was stolen or otherwise fraudulently obtained, and subsequently blocked for use. Unfortunately, there are many dishonest sellers who offer stolen, abused, or otherwise unauthorized Microsoft product keys for sale. Sometimes these product keys are printed on counterfeit labels or cards with a download link to Microsoft software, and sometimes they're distributed with software media that is unauthorized for resale, such as promotional media, original equipment manufacturer reinstallation media, or other Microsoft program-specific media.
Buy Office
If you're not able to get a refund from the original seller and you want to buy Microsoft 365 or Office, click the button below to compare prices and make your purchase from the Microsoft Store or to start a free trial of Microsoft 365.
Buying a product key?
If you're shopping for Microsoft 365 or Office product keys elsewhere, we recommend that you review our tips for safer shopping to make sure you're buying genuine Microsoft software. Be sure to read the tip called Beware of Product Keys Sold Separately if you want to buy a product key online.
