---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/50341#article
headline: "50341: Invalid messaging service SID"
url: https://www.twilio.com/docs/api/errors/50341
inLanguage: en
dateModified: 2026-06-08T11:29:20.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 50341: Invalid messaging service SID

Log Level: ERROR

## Description

You supplied `MessagingServiceSid` with a value that does not identify a valid Messaging Service. Use a Messaging Service SID only in requests that accept `MessagingServiceSid`, and make sure it matches the required `MG` SID format.

### Possible causes

* The `MessagingServiceSid` value does not match the required pattern. A valid Messaging Service SID starts with `MG` and is followed by 32 hexadecimal characters.
* You passed a SID from a different resource type, such as `IS`, `CH`, `AC`, or `SM`, instead of a Messaging Service SID. Twilio uses resource-specific SID prefixes, and `MessagingServiceSid` only accepts an `MG` SID.
* The SID was truncated, copied with extra characters or whitespace, or otherwise changed so it no longer matches the exact service SID returned by the Console or API.
* If you are migrating a Programmable Chat channel, you included `MessagingServiceSid` in the migration request but used a value that is not a valid Messaging Service for that request.

### Possible solutions

* Copy the Messaging Service SID directly from Messaging > Services in Console, or retrieve it from the Messaging Services API, then resend the request with the exact value.
* Validate `MessagingServiceSid` before you send the request. It must be exactly 34 characters long and match `^MG[0-9a-fA-F]{32}$`.
* Do not use an Account, Chat Service, Channel, or Message SID in the `MessagingServiceSid` field. Send only the `MG` SID for the Messaging Service you want to use.
* If you are migrating a Chat channel so you can add SMS or WhatsApp participants in Conversations (classic), create or identify the correct Messaging Service first, then include that `MessagingServiceSid` in the migration request.

#### Additional resources

* [Chat Channel Migration Resource](/docs/chat/rest/channel-migration-resource)
* [Migrating to Conversations (classic) from Programmable Chat](/docs/conversations-classic/migrating-chat-conversations)
* [Messaging Services](/docs/messaging/services)