There is no way to deactivate Office Home & Student, Office Home & Business, Office Professional, or individual Office apps. Instead, you must reinstall and activate using the process described in Activate after reinstalling Office.
Per your question, we would suggest you can follow Where to enter your Office product key - Office Support (microsoft.com) to redeem the product key. Or you can see How to redeem your Office 365 product key - Microsoft Community to see the video of redeeming product key. For more information, please see Using product keys with Office - Office
Verify that Microsoft 365 Apps is using the new activation method. There are three different ways that you can verify that Microsoft 365 Apps is using the new activation method. Open Word and go to File > Account > About Word. Near the top of the dialog, you should see an entry for License ID. For Microsoft 365 Apps, the ID starts with EWW.
Mar 13th, 2019 at 4:59 AM. It's a retail license intended for someone paying for a MSDN subscription. The owner of the MSDN account is the only one authorized to use the software, and it is not allowed to be used in production. If the owner of the account were to cancel their subscription, the key would not expire, and currently activatedTo manually specify the address of the KMS server on the Office client: cscript ospp.vbs /sethst:kms-srv.woshub.com. Change the destination KMS server port: cscript ospp.vbs /setprt:1688. Activate your volume-licensed MS Office version against a KMS server: cscript ospp.vbs /act.
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