Outlook get free busy schedule - AvailabilityView

Hey I'm using graph.microsoft.com/v1.0/me/calendar/getschedule to return the availabilityView for selected users.  I'm not able to generate a value for '4 - working elsewhere' in the availabilityView string. I am of course adding calendar entries with 'working elsewhere' set as the 'show as' value to test this, but the result seems to be '0 - free'.  I'm wondering if anyone has come across this and solved it?  Thanks