# Unsupported MyDataHub-Version

> unsupported-version: HTTP 400. Send a MyDataHub-Version date the API lists, such as 2027-01-15, or leave it out.

Source: https://emailmovers.com/mydatahub/docs/errors/unsupported-version

`unsupported-version` is returned with HTTP status 400. Its type URI is `https://emailmovers.com/mydatahub/docs/errors/unsupported-version`.

## What it means

The MyDataHub-Version header names a date this API does not serve.

## What to do

Send a MyDataHub-Version date the API lists, such as 2027-01-15, or leave it out.

## Example

```json
{
  "type": "https://emailmovers.com/mydatahub/docs/errors/unsupported-version",
  "title": "Unsupported MyDataHub-Version",
  "status": 400,
  "code": "unsupported-version",
  "detail": "Version 2026-01-01 is not served.",
  "next_step": "Send a MyDataHub-Version date the API lists, such as 2027-01-15, or leave it out."
}
```

## See also

- [Versions and reproducibility](https://emailmovers.com/mydatahub/docs/versions.md)

All problem types are listed on [Errors](https://emailmovers.com/mydatahub/docs/errors.md).