Check the original product card, email receipt, or packaging
Sign in to your Microsoft account and check Services & subscriptions
Open Command Prompt as administrator
Run: `wmic path softwarelicensingservice get OA3xOriginalProductKey`
Use PowerShell to retrieve the key from the registry if available
Check the Certificate of Authenticity sticker on the device
Look inside the Microsoft Store purchase history
Use a trusted third-party key finder tool
Contact Microsoft Support
Check with your IT administrator if the license was provided by work or school