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 room1@domain.com | Format-List *

If you know the specific attribute you are after you can still access this variable using select-object.
get-CalendarProcessing -Identity room1@domain.com | Select-Object AllowConflicts