If we use our MAK key and click “Activate over the internet” in Visio this works and reduces the number of MAK keys available correctly, but we don’t want users to have do this and it should be activating using our KMS server (which works for all our other Microsoft products). Feel free to post back should you have further concern. Kindly follow this link to run the repair. We suggest that you run the Office repair on your computer. None of which correctly activate it to the KMS server. Your Office 2016 might be corrupted and this could be one of the probable reason why it keeps on asking for the product key. GVLK from the Microsoft document NY48V-PPYYH-3F4PX-XJRKJ-W4423.I have tried entering the following for the PIDKEY: I am using these Microsoft instructions to do the install: The prompt I get for failed activation includes the option to activate via telephone if you go into a file (excel) and click the File tab, then Account, you should see the 'Activation Required' where your account info should be. I get the following error in the account tab of Visio. The reason for installing MAK is that my organisation does not want to upgrade the licence to Office 365 Visio 2016 (that you assign a licence through the portal). I am trying to install Visio 2016 Standard MAK with Office 365 ProPlus 2016 however it will not activate.