Here are the common errors and how to fix them. This product key has already been used Your product key can only be redeemed once. It isn't meant to be re-used or shared. I have installed Microsoft Office 2019 on a machine which is not mine. It was only helping someone else. I have entered my Account only to confirm if all is OK, it activated correctly. I have not been aware of that this account seems to be permanently associated with that Key. Before doing the clean install of Windows 10, I uninstalled this Office 2019 because I understood there can be problems with a key appearing to be used too often when trying to re-install Office on the same PC. After installing from my installation DVD, when trying to activate Office over the internet I get " This product cannot be activated Report abuse. Hi Maddox. I am sorry to say, that product key is not legitimate, Office Professional Plus 2019 is a volume licence version of Office, used by Companies and Organizations, it is not a consumer licence, that licence key, while it may initially activate (it usually does not) would then need to be re-armed on a regular basis from a This issue occurs because Click-to-Run versions of Office programs or suites running on a server with Remote Desktop Services (RDS), must have Shared Computer Activation enabled. Remote Desktop Services are formerly known as Terminal Services. Shared Computer Activation is only available for Microsoft 365 Apps. Other releases are not supported. And then reinstall Office 365 apps, open Word and activate it, see if the original issue can be fixed. If issue persists, to help you do further troubleshooting, I'd like to confirm information below: 1.Please share a screenshot about "Every time I open Word, it says that my MS Office 2019 Professional Plus is not activated". So I tried telephone activation. The installation ID is entered correctly. But they said invalid. Therefore, I checked the Activation Key Email. On the Email, they attached a video link in it. The title of the video is ''How to activate MS Office 2019 using telephone activation without calling Microsoft'' But, I didn't followed the video guide. issues activating Office Professional Plus 2019 installed using deployment and retaining only the deployed apps 0 VLSC: this product can't be installed on the selected update channel I need to do a clean reinstallation of Windows 10 and Microsoft Office 2016. Currently, Office correctly shows that it is activated with my Microsoft account, but when I log into my Microsoft account it does not show Office, or anything else, in my products. I'm worried that I will not be able to re-install Office. tl:dr - Microsoft says my copy of pre-installed Office apps is not activated after I reset my laptop due to issues. My laptop (Lenovo Ideapad L340 Gaming) came pre-installed with Microsoft Office Professional Plus 2019. Due to performance issues I had reset my laptop more thrice, and this never affected Microsoft Office in any way. vZ3f.