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 To find your MS Office product key for the 2019 edition, simply look in your confirmation email for a 25-digit number. Keep this number handy for any downloading and installation. Get genuine Office products published by Microsoft, properly licensed, and have genuine activation keys.
Microsoft supplies Office 2019, Office 365, and Office 2016 image files in IMG format rather than the regular ISO format. If you are using Windows 10, double-click on the downloaded IMG file. As soon as you do that, Windows 10 will automatically mount the image file in File Explorer. Open the mounted drive and double-click on the setup.exe file
The same product key works for many Office 2019 installs within the company. At some stage the organization or Microsoft realizes the product key has ‘leaked’. I guess that applies to the Microsoft Office LTSC Professional Plus 2021 product that they're selling.
There is no longer a deactivate option, when you get a new PC, you simply go to that page on Office.com or the Services and Subscriptions page on your Microsoft Account, and install Office on the new PC, the old PC will deactivate automatically once Office is installed on the new PC . . . If you encounter any activation errors on the new PC
