I have a PC that came with some sort of cheesy office version like "Office for those who use word on Thursdays" or some such nonsense. The version came with the PC.
I own Office Professional Pro 2016 so i removed the cheesy version and installed the Pro version. I entered a product key, activated and checked everything out. It was good after three opens and closes.
I go in today and wham, everything is asking me to activate office and when I do, I click the option to enter a key instead and no joy. It just bounces back to the un-activated version. I am running this as administrator.
I have removed all vestiges of office and run the clean up tool and reinstalled, same problem. Now, the email on the PC IS an Office 365 email address, but I have not installed the O365 version of office.
I have also deleted the OEM registry keys as shown in the MS article.
Anyone got any other ideas? It's HAUNTING ME.