How to fix Microsoft Office 365 Activation Error

Windows activation failed and Microsoft office 365 changed into Microsoft office 2016. You did everything such as uninstalling it and reinstalling it however it doesn't work. Here in this article, I will discuss everything on how you can solve this issue.

Method 1:

Go to the following directory and run OSPPREARM 

C:\Program Files (x86)\Microsoft Office\Office16 and right-click OSPPREARM as administrators  (OSPPREARM location may be different in your case.)