Remotely access your voicemail by calling yourself from an outside line or by dialing * followed by your extension locally and then pressing star to check your voicmail does not currently function. And the setting "Disable in Voicemail Menu" as no bearing on this functionality whatsoever. After a lot of troubleshooting, I am thinking this is an Asterisk issue but would like someone else to confirm?
Workaround: Enabling VmX Locator as follows seems to fix the problem