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

# Passkey Already Registered

> This passkey is already registered

## Cause

This passkey credential is already stored on the account. Guile did not register a duplicate credential.

## Fix

Use the existing passkey to sign in, or register a different authenticator with [get passkey registration options](/api-reference/passkeys/get-passkey-registration-options) and [register a passkey](/api-reference/passkeys/register-a-passkey).

## Retry safety

Not retryable until the underlying state or request changes.

## Raised by

These operations can return this problem:

* [Register a passkey](/api-reference/passkeys/register-a-passkey)

## Example

```json theme={null}
{
  "type": "https://docs.guile.app/problems/passkeyAlreadyRegistered",
  "title": "Passkey Already Registered",
  "status": 409,
  "detail": "This passkey credential is already stored on the account. Guile did not register a duplicate credential."
}
```