If you need to find your product key for Windows Server 2016, there are a few different ways you can do it. One way is to use the Command Prompt. To do this, open the Command Prompt and then type:
wmic path SoftwareLicensingService get OA3xOriginalProductKey
This should give you your product key for Windows Server 2016.
Another way to find your product key is to use the PowerShell. To do this, open PowerShell and then type:
Get-WmiObject -Query "Select * from SoftwareLicensingService" | Select-Object -ExpandProperty OA3xOriginalProductKey
This should also give you your product key for Windows Server 2016.
If you need to find your product key for another version of Windows Server, you can use a similar method. For example, for Windows Server 2012, you would use the following command:
wmic path SoftwareLicensingService get OA3xOriginalProductKey
And for Windows Server 2008, you would use the following command:
Get-WmiObject -Query "Select * from SoftwareLicensingService" | Select-Object -ExpandProperty OA3xOriginalProductKey