---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/53621#article
headline: "53621: Invalid AWS credentials to access external S3 bucket in composition settings"
url: https://www.twilio.com/docs/api/errors/53621
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 53621: Invalid AWS credentials to access external S3 bucket in composition settings

Log Level: WARNING

## Description

The AWS credentials configured in your account's composition settings are not valid.

The media will not be uploaded until the configuration has been fixed.

### Possible causes

* If you have specified your own bucket and access credentials, this is most likely due to the fact that the AWS Access Key ID and Secret Access Key are not correct.

### Possible solutions

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