How to activate Microsoft Office 2016 Professional Plus permanently?

To activate Microsoft Office 2016 Professional Plus permanently, follow these steps:

Open any Microsoft Office application such as Word or Excel.
Click on the “File” tab in the top-left corner of the application window.
Select “Account” or “Microsoft Office Account” from the menu on the left.
Click on “Activate Product” or “Change Product Key” option.
Enter your valid Microsoft Office 2016 Professional Plus product key when prompted.
Follow the on-screen instructions to complete the activation process.
Once activated, Microsoft Office 2016 Professional Plus will be permanently activated on your computer.