csrutil disable
Restart computer
In the terminal, type
sudo open /Applications/TextEdit.app /System/Library/LaunchDaemons/com.apple.ManagedClient.enroll.plist
change
<key>com.apple.ManagedClient.enroll</key>
<true/>
to
<key>com.apple.ManagedClient.enroll</key>
<false/>
So that the changes take effect
skipmdm.com just worked for me on a 2018 intel mac mini. I updated from mac os 14.1 to 14.2 and after logging in was locked down by the MDM screen.