Also, it should be noted that the customer is contractually obligated to not send personal data.  There are not triggers on the Adobe side to stop this from happening.

As the data processor, AAM is built to enable clients to create, manage, and activate audiences at scale.  Privacy by design is at the cornerstone of the DMP.  As data controllers, Adobe customers own their data and determine how it will be used.  Personal data – such as first name/last name, phone ...

1) How large is the first party base segment?  If it’s on the smaller side, it could be causing issues.  In addition, I would look at the overlap between this segment and the Acxiom 3rd party traits via an Overlap report to determine how good the overlap is for modeling purposes.  If possible, you m...