---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/520016#article
headline: "520016: Identifiers skipped during bulk add"
url: https://www.twilio.com/docs/api/errors/520016
inLanguage: en
dateModified: 2026-04-01T03:32:01.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 520016: Identifiers skipped during bulk add

Log Type: TWILIO

Log Level: WARNING

## Description

Some identifiers were skipped during bulk processing to preserve data integrity.

### Possible causes

* Batch file included some duplicate or improperly formatted identifier values

### Possible solutions

* Deduplicate the source data
* Execute a format validation check on the batch to ensure all entries meet schema requirements before transmission