We are using the API to create CRM Based Tailored Audiences that contain phone numbers and email addresses. I was previously told that a single Tailored Audience can contain both types of data, but we are unable to see how that can be implemented via the TON API. We first create the Audience and specify a list_type. The subsequent file uploads have no place to specify or modify the list_type of the audience to which they are being sent. Can someone please confirm if these audiences can have only one type of data each?
Additionally, we see in the documentation that CRM Based Audiences can be created with list_type=null. Is this a use case that no longer exists, as list_type is a required field? If so, will we encounter errors if users are trying to update old audiences that never received as list_type?