---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21504#article
headline: "21504: RecordingSid is required."
url: https://www.twilio.com/docs/api/errors/21504
inLanguage: en
dateModified: 2025-12-18T21:40:49.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21504: RecordingSid is required.

Log Level: ERROR

## Description

You `POST`ed to the /Accounts/\{AccountSid}/Transcriptions resource, but you did not include a RecordingSid.