For us to assist you further, would you please confirm where are you inputting the preferred name?
I am entering the preferred name (in quotes) as the middle name in the "general demographics". Should I be entering it elsewhere?
To reflect the preferred name in PowerTeacher Pro(PTP), you would need to add the middle name to the first name. In case, you would not prefer to do so, then you need to reach out to the Designated Support Contact of your district so that they could raise it as a customization request.
I apologize but access to the student's preferred name should not require special customization. It should be part of the primary tools the teacher needs to support the student.