---
page_type: error
code: 21719
message: "21719: Incompatible Messaging Service/A2P Use Cases"
level: ERROR
product: Programmable SMS
---

## Description

Request was unsuccessful due to incompatibility between the Messaging Service use case and the A2P use case for the messaging service.

### Possible Causes

- Updating a Messaging Service use case to one that is not compatible with the current A2P use case for this messaging service.
- Creating a new A2P campaign with an A2P use case that is not compatible with the current Messaging Service use case.

### Possible Solutions

Update the request to pass a compatible A2P/Messaging Service use case. The following resource can be used to retrieve all compatible A2P use cases for a specific Messaging Service: https://messaging.twilio.com/v1/Services/MGXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Compliance/Usa2p/Usecases