---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/19021#article
headline: "19021: Only one channel can be set as primary"
url: https://www.twilio.com/docs/api/errors/19021
inLanguage: en
dateModified: 2026-03-11T18:38:39.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 19021: Only one channel can be set as primary

Log Type: APPLICATION

Log Level: ERROR

## Description

is\_primary can be set to true only for one channel

### Possible causes

Request with is\_primary set to True for more than one channel

### Possible solutions

Ensure only each channel has only 1 is\_primary set to true