---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/520010#article
headline: "520010: Bulk trait upsert failed"
url: https://www.twilio.com/docs/api/errors/520010
inLanguage: en
dateModified: 2026-04-01T03:32:01.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 520010: Bulk trait upsert failed

Log Type: TWILIO

Log Level: ERROR

## Description

Bulk trait upsert encountered validation discrepancies.

### Possible causes

* Missing fields, unmatched data types, or duplicate mapping keys within the batch payload
* Malformed JSON structure
* No valid traits
* No Identifiers

### Possible solutions

* Validate the batch locally prior to submission
* Implement granular error handling to process valid records while gracefully managing exceptions
* Register trait in trait settings