> ## 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.

# Mutually Exclusive Challenge Methods

> Only one challenge method can be requested

## Cause

The request includes challenge methods that cannot be used together.

## Fix

Choose one challenge method and resubmit the request. Pick one challenge method for the request. Remove the other method fields and retry.

## Retry safety

Not retryable until the underlying state or request changes.

## Raised by

These operations can return this problem:

* [Create an authentication challenge](/api-reference/challenges/create-an-authentication-challenge)

## Example

```json theme={null}
{
  "type": "https://docs.guile.app/problems/mutuallyExclusiveChallengeMethods",
  "title": "Mutually Exclusive Challenge Methods",
  "status": 422,
  "detail": "The request includes challenge methods that cannot be used together."
}
```