---
title: 4009: Sender line has no RCS account | API Docs
description: The sender line has no RCS account configured.
---

The sender line has no RCS account configured, so its RCS capability cannot be determined. This is an HTTP 503 error about the **sender** line on your account, not the recipient — retrying will not help until the line is repaired.

Do not treat this as “the recipient does not support RCS”. The check produced no answer about the recipient at all.

## Troubleshooting

- Send from a different line on your account, or send without `preferred_service` so delivery falls back to SMS.
- Contact support to have RCS re-enabled on the affected line.