I've got a webmap that has been shared with a group in our organization. AGOL accounts within our organization are set up as members of this same group. When users login to their account they can't see the map in Collector 10.2.4 on iOS. They can login through a browser, validate membership in the group, see the map and open it up. Is there any additional criteria that needs to exist for a map to be visible to Collector?