This is fixed in 14.3:
Services fail to stop when using smc -stop
Fix ID: ESCRT-3251
Symptoms: smc -stop fails unless the password is specified on the command-line. Relying on the UI to enter a password does not work.
Solution: Fixed code that verifies the calling processIn 14.2.5569 if you have password for stopping the service, it doesn't stop when you run "smc -stop". If you remove the password from the SEPM console, then service will stop