The Brand Registration SID you are trying to use to register a new US A2P campaign use case is not registered or the Brand Registration SID is not valid for the given use case.
status
field using the Brand API. If the brand has been registered, it will have a status of APPROVED. If this is the case, verify that the Brand Registration SID passed into the request matches the Brand Registration SID that has been registered and retry the request.brand_type
field using the Brand API. If the brand_type is STARTER, the brand can only be used to create STARTER campaign use cases. If it is a STANDARD brand_type, the brand can be used to create any other type of campaign use case.