The KMS host keeps an ongoing record of the state of each KMS client that tries to activate or reactivate. Failed requests indicate the KMS host doesn't support certain KMS clients. For example, if a Windows 7 KMS client tries to activate against a KMS host that was activated by using a Windows Vista KMS key, the activation fails. Only one Office KMS key should be installed and used for activation. If you deploy Microsoft 365 using Key Management Service (KMS) as the activation method, note that: You can't activate Microsoft 365 using KMS if you use Windows Server as the KMS host. A patch isn't available to allow activation of Microsoft 365 apps. Recently I have bought HP Spectre x360 15t through Amazon. However, when I try to active Excel of Microsoft Office Home and Student 2019 a message says the specified Product Key has already been activated the maximum number of times permitted for your software license as specified in the Microsoft Software License terms, etc There are never supposed to be resold. You will see that they are MSDN keys by running this script: cscript ospp.vbs /dstatus. You will get something like this: LICENSE NAME: Office 19, Office19ProPlus2019MSDNR_Retail edition. LICENSE DESCRIPTION: Office 19, RETAIL channel. LICENSE STATUS: ---LICENSED---. 1.In the Activation Wizard, select the country/region where you reside and where you plan to use the product. The wizard provides one or more telephone numbers appropriate for your selection. Use the number provided on your Activation Wizard screen to call the Microsoft Activation Center. 2.Call the Activation Center. From your problem description, you can activate your Office for Mac 2019 in your Mac. If you would like to use license removal tool to remove your Office license as Jeff suggested in the main thread. You can refer to this article about How to remove Office license files on a Mac . Came to open Outlook and it says the product isn't activated. It's been fine for over 6 months. Re-entered my key, but soon after it says the same again. Entered the key at setup.office.com and it says it's invalid! Now my office apps have disappeared completely from my PC!! 1 day ago · See Office 2016 is good but Office 2019 is working as a pro. If you’re going to use office 2019 for free; we are here with MS office 2019 product key. Do not go anywhere and find an active key below. Microsoft Office 2019 Product Key. You need a license key for office 2019, professional, home and business 2019. If it's a retail license you can move it from computer to computer as many times as you want to, as long as you don't have it installed on two computers at once. But if it's an OEM license, it's permanently tied to the first computer it's installed on and it may never be moved to another. You can use it as many times as you want to *only* if Verify that shared computer activation is enabled for Microsoft 365 Apps. Make sure Device-based licensing and robotic process automation (RPA) are disabled. Verify that activation for Microsoft 365 Apps succeeded. Reset Microsoft 365 activation state. Enable licensing token roaming. Edit the Identity registry value. iIXPtC.