Segment export: exportable in segment export
"Exportable" section shows the number of customers out of segmented customers that have mandatory attributes (if defined) present. Mandatory attributes are usually defined by the administrator and those are the ones that must be present in order for export to be sucesful. If customers do not have those attributes in place, export is not possible.
For example, below the number of exported customers is 120, while segmented 121. This means that out of 121 segmented customers, but only 120 have mandatory attributes defined for this export.
"Exportable" shows "120 out of 890". This means that 890 customers in total have mandatory attributes present and out of this number exported will be 120 customers.
Learn more: To check which attributes are defined as mandatory and how to change them, please refer to this article.