Assignment import says constituent does not exist

For the established (legacy) Volunteer Management portal. These steps differ from the newer Volunteer Management interface. Staff access is determined by their assigned administrator role(s). Administrator roles have fixed capabilities; the configurable volunteer roles described here are separate from staff administrator roles.

The assignment import looks up each row’s constituent_id as a school constituent external ID. A missing-constituent failure affects that row. Compare identifiers exactly, including leading zeros, and import/fix the constituent before retrying its assignment. Do not interpret a partial-row notice as failure of the whole file.