I have a problem with office professional plus 2016. They get the activation key with a MAK key and it works fine.
I've been installing them on many computers and my problem is on computers with windows 10 with a preinstalled office version.
First I have uninstalled it, using the tool of Microsoft since the uninstallation is not present in the add/remove software of the control panel.
Then after restarting the computer, I install it and if I look in "account", I see this
Then, the next day, I get this
So I try to re-enter the key, but activation fails. If I uninstall everything, and re-install it, it works for one day and the the problem occurs again.
I've notice that the limitation date changes every day, and even though its says that most features will be disables, it stays fully functional.
Thank you for your help.