# E28015 — AMBRoutingRuleDefaultExists

This business already has a default routing rule.

- **HTTP status**: `409`
- **Type**: `conflict_error`
- **Name**: `AMBRoutingRuleDefaultExists`

## What to do

A business has at most one default, which catches conversations no other rule matches. Edit the existing default, or create this rule with a match of its own instead.

Operations that resolve this:

- [List Apple Messages for Business routing rules](/docs/api/reference/list-amb-routing-rules)

## Related

- [Idempotency](/docs/api/idempotency): safe retries and key reuse rules
- [E28xxx — Apple Messages for Business](/docs/api/errors/E28xxx): every code in this range
- [Errors](/docs/api/errors): the full wire contract, status mapping, and error catalog
- [Error handling](/docs/guides/errors): branching on `type` and `code`, validation details, and `vendor_code`

## Related resources

- [Should I use a Bird SDK or call the API directly?](/explained/platform/should-i-use-an-sdk-or-call-the-api-directly) (answer)
- [Build your first integration](/learn/paths/integration) (course)
- [Send your first email](/docs/get-started/send-your-first-email) (docs)

[Get an implementation brief](/learn/workspace?topic=api-basics)