---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/60331#article
headline: "60331: Locale requested is not supported by Verify Text-To-Speech conversion"
url: https://www.twilio.com/docs/api/errors/60331
inLanguage: en
dateModified: 2026-06-08T11:29:20.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 60331: Locale requested is not supported by Verify Text-To-Speech conversion

Log Type: APPLICATION

Log Level: ERROR

## Description

Twilio returns this error when your Verify request includes a `locale` for voice delivery that Twilio cannot convert with Text-to-Speech. For Verify `call` channel verifications, Twilio can resolve the language automatically from the destination phone number. If you send an unsupported `locale` override, update it to a supported value or remove it so Twilio can apply the default language selection and fallback behavior.

### Possible causes

* Your Verification request included a `locale` override that is not supported for Verify voice delivery.
* The `locale` value does not match a supported Verify language tag for the Voice channel.
* The requested spoken locale is not available for Twilio Text-to-Speech. Twilio requires supported language values for synthesized speech.
* If you use a pre-approved template, the requested language is not available for that template. Pre-approved templates support only a subset of Verify languages.
* If you use a custom template, the required translation for the requested locale has not been provided.

### Possible solutions

* Remove the `locale` parameter and retry the verification. Twilio will resolve the language from the phone number country code and fall back to English or the template default translation when needed.
* Set `locale` to a supported value from the Verify supported languages list. For voice delivery, confirm that the locale is available for the Voice channel.
* If you need a specific spoken locale, verify that Twilio Text-to-Speech supports that language and locale before you send the verification.
* If you use a pre-approved or custom template, confirm that the template type supports the requested locale and that the required translations are available.

#### Additional resources

* [Verify supported languages](/docs/verify/supported-languages)
* [Verifications API reference](/docs/verify/api/verification)
* [Text-to-Speech (TTS)](/docs/voice/twiml/say/text-speech)