---
page_type: error
code: 51104
message: "51104: Twilsock: Token doesn't contain service instance"
level: ERROR
---

## Error - 51104

### Token doesn't contain service instance

#### Possible Causes

The token doesn't have a service instance.

#### Possible Solutions

Confirm a service instance is being passed in the token. To check whether the access token is structurally correct, you can use the tools available at [jwt.io](https://jwt.io).