Hi, I am an Independent Advisor, and welcome to Microsoft Q&A.
If you are trying to look for your Windows 10 activation key, you need to know if you bought the key separately or if your machine came with a pre-activated license.
To check the status of your license, please follow the steps below.
Go to Settings > Update & Security > Activation.
If you're seeing an activation error, follow these steps.
Press Win + I > Update & Security > Activation > Click Troubleshoot.
Sign in with your Microsoft account if prompted.