Columns returned by portal/admin/person

A customer has 134 columns on the Person table. 

When I call portal/admin/person via Postman, I receive 53 columns for a given UID_Person. 

When I call qerApiService.typedClient.PortalAdminPerson.Get from the portal, I receive an IEntity with only 34 columns.

When I go to the Portal and select "Create Identity" I see all the fields I need to access, but PortalAdminPerson is only returning a sub-set of these.

What is going on here?  What determines the columns recognized by PortalAdminPerson?

I can't see anything strange about the columns it is not recognizing.