external_ref_conflict
HTTP status: 409 (Conflict)
Title: External reference conflict
Cause
Another contact in this organization already has this externalRef. An externalRef is unique per organization.
How to fix it
Use another externalRef, or update the contact that already has it by its externalRef.
Set the parameter named below and send the request again.
Parameter: externalRef
Every error carries requestId and the Request-Id header. Send it when you write to support.