enterprise

I bought a used Microsoft laptop surface studio and I found it came with windows 11 enterprise but it can't be activated. How can I activate it or get activation key?

One of our SPro4's is coming up with the following error on boot;- One or more selected boot devices has a SecureBoot violation! Returning to Surface settings. Please verify SecureBoot key configuration and boot device selection. We had Windows 10 Enterprise edition installed.