If you don’t want to plug the key into your main machine, you can use or Support Chat :
This is the most reliable way to check the status of a key already in use on your system. Command Prompt as an administrator. slmgr /dli to see basic license info (Retail vs. OEM). slmgr /xpr to check if your Windows is permanently activated. Volume Activation Management Tool (VAMT): Part of the Windows Assessment and Deployment Kit (ADK) microsoft product key checker
(Get-WmiObject -Class SoftwareLicensingService).OA3xOriginalProductKey If you don’t want to plug the key
For business or volume licenses, you can view and export valid product keys directly from the Microsoft 365 Admin Center Billing > Your products > Volume licensing 3. How to Verify a Key Before Installation microsoft product key checker