Turning off Device Enrollment Notifications on MacBook Pro
Just in case you're still confused about this issue,
restart your mac in recovery mode,
in terminal, type in command:

csrutil disable; reboot


This will disable system integrity protection and restart your mac.

Open your terminal again, type in command:

sudo mv /System/Library/LaunchAgents/com.apple.ManagedClientAgent.enrollagent.plist /Library/LaunchAgentsDisabled
sudo mv /System/Library/LaunchDaemons/com.apple.ManagedClient.enroll.plist /Library/LaunchDaemonsDisabled


This should do the trick.

However, don't for get to re-enable your system integrity protection by restarting your mac in recovery mode, typing in command:

csrutil enable


You can check your SIP status with command:

csrutil status


Good luck!