Sold device. Signed out of iCloud, still reappears in Find My

Hello,

I sold my MacBook Pro, and signed out of iCloud, but the new user is trying to activate it, and it seems “Find My” is still associated with my Apple ID.

The MacBook Pro doesn’t show up in “Devices” associated with my Apple ID, but it reappears in “Find My” even after several attempts to remove from different devices/browsers.

Any ideas how to resolve this, or why this occurs?

Thanks for your time.