---
title: 3021: Template submission in progress. | API Docs
description: This template's media preparation is still running.
---

**HTTP status:** `503`.

The same submission is actively preparing its media header; the request is bounded and resumable. Retry the unchanged body.

## Troubleshooting

- Resend the identical request after a short wait; a changed body starts a new submission instead.

## Related

- [Creating a template](/channel/whatsapp/api/resources/templates/methods/create/index.md)