The 365 Activation Error 0X80073EFD refers to an activation error, generally appears in Microsoft Office 365 and Office 2016 and still carried over its pr predecessors which signifies that Office cannot be activated.
Office 365 is a very good and useful tool which comes pre-installed with the Windows 10 operating system, but if you want to use it, then you need to purchase it from your retail store or direct from the Microsoft website by following few simple steps.