# IDEMPOTENCY_CONFLICT

This idempotency_key belongs to a different call.

- **HTTP class:** 409
- **Retryable:** no

## What happened

The `idempotency_key` was used within the last 24 hours for a call with different arguments.

## Fix

Use a new key for every new call; reuse a key only to repeat the identical call after a timeout or a retryable error.

## What to tell the user

Nothing.

## Agent hint

The exact `error.hint` text; Carnival fills each `<…>` for the call.

```text
This idempotency_key belongs to a different call. Use a new key; reuse one only to retry the identical call.
```

## Related

- [`INTERNAL_ERROR`](https://carnival-staging.dev/docs/errors/INTERNAL_ERROR.md): Temporary problem at Carnival.
- [`DEPLOY_ALREADY_FINALIZED`](https://carnival-staging.dev/docs/errors/DEPLOY_ALREADY_FINALIZED.md): That deploy is already published.

All error codes: [error codes](https://carnival-staging.dev/docs/errors.md)