---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/91104#article
headline: "91104: Event type not found"
url: https://www.twilio.com/docs/api/errors/91104
inLanguage: en
dateModified: 2026-06-09T11:00:42.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 91104: Event type not found

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when your Event Streams request references a `type` value that Twilio cannot match to an available Event Type resource. Event Streams subscriptions are built from Event Type and schema version pairs, and you can list valid event types or fetch a specific one through the Event Type resource.

### Possible causes

* The `type` value in your request does not exactly match an Event Type resource returned by `GET /v1/Types` or `GET /v1/Types/{Type}`.
* The event type name is misspelled or uses the wrong namespace, so Twilio cannot identify it as a valid Event Streams event type.
* You are creating or updating a subscription, or adding a subscribed event, with an event type that is not available for use in Event Streams. Subscriptions and subscribed events both require valid event type values.
* You are trying to use an event type whose status no longer allows new subscriptions or additions, such as `restricted` or `discontinued`.

### Possible solutions

* List available event types with `GET /v1/Types` and copy the exact `type` value from the response before you create or update a subscription.
* Fetch the specific event type with `GET /v1/Types/{Type}` to confirm that the event type exists and that the identifier in your request is correct.
* If you are creating a subscription or adding a subscribed event, update the request so the `type` value matches a valid Event Streams event type.
* Verify the event type status before you add it to a subscription. If the event type is `restricted` or `discontinued`, replace it with a supported alternative.

#### Additional resources

* [Event Type resource](/docs/events/event-streams/event-type-resource)
* [Subscription resource](/docs/events/event-streams/subscription)
* [Event types lifecycle](/docs/events/event-types-lifecycle)