Most retail purchases of Microsoft Office 2021 require you to link the software to a personal or business Microsoft Account (MSA) during initial setup.
Run the application (most do not require a full installation). The software will automatically scan your computer.
cscript "C:\Program Files\Microsoft Office\Office16\ospp.vbs" /dstatus
If you found your key or verified it is linked to your Microsoft Account, you can migrate the software to a new machine.

