I developed a Mac VPN application using NEKit, and there was no problem when the debug was running. The connection was successful. Both Network Extensions and Personal VPN have been turned on, and App Sanbox has been turned on.
Mac external distribution signature: design --deep -f -s "Developer ID Application: XXX" XXX.app.
After packaging, it is used by the client. There is no problem opening, but the error log print of Permission denied appears when the connection is made.