---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/45205#article
headline: "45205: Requested Flex Flow is not found"
url: https://www.twilio.com/docs/api/errors/45205
inLanguage: en
dateModified: 2026-06-09T11:00:42.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 45205: Requested Flex Flow is not found

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when a Flex request or related messaging request references a Flex Flow that Twilio cannot locate. A Flex Flow links a messaging identity, such as an SMS number or web chat identity, to Flex and defines how inbound messages are handled.

### Possible causes

* The request references a Flex Flow SID that does not exist when Twilio tries to fetch, update, or use a Flex Flow resource identified by an `FO` SID.
* No Flex Flow exists for the messaging identity you are connecting to Flex. Each phone number, chat channel, or other messaging contact identity needs a corresponding Flex Flow.
* For SMS, the phone number was not registered on the Flex Messaging page and no Flex Flow was created for that number.

### Possible solutions

* Verify the Flex Flow SID in your request. Then confirm that the resource can be fetched from `/v1/FlexFlows/{Sid}` or that it appears in the Flex Console.
* Create a Flex Flow for every messaging identity that you connect to Flex. You can manage Flex Flows in the Flex Console or with the Flex Flow API.
* For SMS, register the phone number on the Flex Messaging page so Twilio links the number's message handler to Proxy and creates a Flex Flow. If you configure SMS manually, point the phone number's message handler to the Flex Proxy Service and create the Flex Flow entry through the API.
* When you create or update the Flex Flow, provide the integration settings required for the selected `integrationType`. Use `integration.flowSid` for `studio`, `integration.url` for `external`, and `integration.workspaceSid`, `integration.workflowSid`, and `integration.channel` for `task`.

#### Additional resources

* [Manage Flex Flows](/docs/flex/developer/messaging/manage-flows)
* [Flex Flow resource API reference](/docs/flex/developer/messaging/flow)
* [Receive inbound messages from SMS, WhatsApp, and Facebook Messenger](/docs/flex/developer/messaging/inbound-messages-channels)