Some powershell get commands only output a handful of the object properties get-CalendarProcessing being one such command, than returns just one property.
To get all properties of an object you can pipe to format-list *
get-CalendarProcessing -identity email@example.com | Format-List *
If you know the specific attribute you are after you can still access this variable using select-object.
get-CalendarProcessing -Identity firstname.lastname@example.org | Select-Object AllowConflicts