Office 365 (ProPlus) - Re-activate Microsoft Office ProPlus
Users who need to re-activate Microsoft Office ProPlus may need to run the Office 365 Support and Recovery Assistant. If the user previously had a version of Microsoft Office which expired, they may be encountering this issue because Microsoft Office is still registering the old product key.
- If you are running Windows, navigate to this Microsoft article and download Microsoft's Office 365 Support and Recovery Assistant. Follow the given set of instructions.
If you are running Mac OS, navigate to this Microsoft article and download Microsoft's license removal tool. Follow the given set of instructions.
- After the set of instructions is completed, restart the computer and open a Microsoft Office application. If the tool worked successfully, you should be prompted to authenticate upon opening the application, which will activate Microsoft Office.