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