---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/53664#article
headline: "53664: Invalid URL for external S3 bucket in composition settings"
url: https://www.twilio.com/docs/api/errors/53664
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 53664: Invalid URL for external S3 bucket in composition settings

Log Type: APPLICATION

Log Level: ERROR

## Description

The S3 bucket URL configured in your account's composition settings is not valid.

Media composition has been marked as FAILED and will not be retried.

### Possible causes

* If you have specified your own bucket, this is most likely due to the fact that the URL does not conform to an S3 URL.

### Possible solutions

* In the composition settings section of your account's console, set a valid S3 URL for uploading media or disable the external storage (media will be uploaded to the default bucket).