My new computer iCloud is locked to previous owner

Contact previous owner and remove the computer Check your Apple ID device list to see where you're signed in - Apple Support

And then follow the article What to do before you sell, give away, or trade in your Mac - Apple Support

Apple values your privacy and has safeguards in place to ensure that no one can access the device.

You will need to reach out to the owner because it is the owner’s responsibility to properly erase the device before selling it.

Until then, it is locked. 🔐