Hi, I'm Estrella. I'll do my best to help you.
Did you purchase it from the Microsoft Store? If so, then you have a digital entitlement. As long as you are connected to the internet and logged in to the account used for the purchase, it should activate automatically.
If not, please follow the steps below:
Disconnect from the internet
Press Win+I, go to System > Activation. Click "Change product key," enter "VK7JG-NPHTM-C97JM-9MPGT-3V66T," and hit activate.
Reconnect to the internet, then log in to your Microsoft account used for the purchase.
Restart your computer.
If the issue persists, I suggest contacting Microsoft Support directly so they can verify your purchase.
Click this link: https://support.microsoft.com/contactus/
Make sure you are signed in to your active Microsoft account.
Type "Chat with an agent" and press Enter.
Click the "Contact support" button at the bottom.
Choose the Products and services for which you need help.
Follow the on-screen prompts to connect with a live agent.
Or, select the "Call me back" option and complete the information so they can call you.