---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/13803#article
headline: "13803: SMS verb not supported in this realm"
url: https://www.twilio.com/docs/api/errors/13803
inLanguage: en
dateModified: 2026-03-20T20:33:25.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 13803: SMS verb not supported in this realm

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when you use the `<Message>` TwiML verb in a Twilio Region that does not support it. `<Message>` is currently supported only in the default `US1` region. It is not available in `IE1` or `AU1`.

### Possible causes

* You used `<Message>` in `IE1` or `AU1`, where that TwiML verb is not currently supported.
* Your application depends on a feature that is not available in the selected Twilio Region. Twilio Regions operate in isolation, so unsupported products and features do not work in the target Region.

### Possible solutions

* Run the `<Message>` step in the default `US1` region, where Twilio currently supports it.
* If your application must use `IE1` or `AU1`, remove or redesign the `<Message>` step so the flow uses only features supported in that Region.
* Confirm your Region selection before deployment and verify that every product and TwiML verb used in the flow is supported in that Region.

#### Additional resources

* [Error and Warning Dictionary](/docs/api/errors)
* [TwiML Message: `<Message>`](/docs/messaging/twiml/message)
* [Regional product availability](/docs/global-infrastructure/regional-product-and-feature-availability)