> ## Documentation Index
> Fetch the complete documentation index at: https://docs.methodfi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# mTLS Errors

## Request Errors

The request failed client-certificate validation. These errors occur only for teams provisioned for [mTLS](/2025-07-04/reference/mtls).

Unlike other request errors, these are returned before the request reaches Method's core API. The response body is wrapped in `{ "error": { ... } }` and has no top-level `success` or `message` field.

### `UNAUTHORIZED`

No client certificate was presented, or the presented certificate failed verification. Returned with HTTP status `401`.

```json theme={null}
{
  "error": {
    "type": "INVALID_REQUEST",
    "code": 401,
    "sub_type": "UNAUTHORIZED",
    "message": "A valid client certificate is required to access this resource. Contact your account administrator about mTLS provisioning."
  }
}
```

***

### `FORBIDDEN`

The certificate is valid but its Subject DN is not authorized for the resolved team. Returned with HTTP status `403`. Confirm the Subject DN registered with Method matches the one on your certificate.

```json theme={null}
{
  "error": {
    "type": "INVALID_REQUEST",
    "code": 403,
    "sub_type": "FORBIDDEN",
    "message": "The presented client certificate is not authorized for this team. Contact your account administrator."
  }
}
```