You dont have an actual digital license or key so try this:
- Go to Action Center (looks like a chat box on the lower right hand side of the taskbar) > Click airplane mode > activate it to go offline
- In a command prompt, type the command: slmgr -upk
- Go to Settings > Update & Security > Activation > Change Product Key. From there insert the Generic Key located in the following link: https://winaero.com/blog/generic-key-to-install...
- This should activate the machine, restart it, and re-enter the key you need.