# `STEP_UP_UNAVAILABLE` Re-authentication check temporarily unavailable

Source: https://checkslip.com/en/problems/step-up-unavailable

- **HTTP status**: `503`
- **Credit**: No credit taken

## Meaning

The re-authentication (step-up) check did not respond, so nothing was done and no credit was used.

## Fix

Wait for `Retry-After`, then resend with the same proof (it has not been used yet).

## Example response

```
{
  "type": "https://checkslip.com/problems/step-up-unavailable",
  "title": "Re-authentication check temporarily unavailable",
  "status": 503,
  "code": "STEP_UP_UNAVAILABLE",
  "instance": "01a18600-0000-7000-8000-000000000000"
}
```