Help with JSON/XDATA Mapping

Hi There,

I'm fairly new to ObjectScript/Ensemble and I'm sure I may be fundamentally misunderstanding how the %JSONImport/%JSONExport and XDATA mapping work and I was hoping you good folks could help me out.  I'm essentially trying to create an object that I can use to translate from one JSON schema to another. 

First my class:

Class SERVICESVCPKG.Model.AthenaAppointment Extends (%Persistent, %DynamicAbstractObject, %JSON.Adaptor)
{

Parameter %JSONENABLED = 1;

Property AppointmentID As %String(%JSONFIELDNAME = "AppointmentID", %JSONINCLUDE = "inout");

Property AppointmentType As %String(%JSONINCLUDE = "inout");

Property AppointmentTypeID As %String(%JSONINCLUDE = "inout");

Property Date As %String(%JSONINCLUDE = "inout");

Property DepartmentID As %String(%JSONINCLUDE = "inout");

Property Duration As %Integer(%JSONINCLUDE = "inout");

Property PatientAppointmentTypeName As %String(%JSONINCLUDE = "inout");

Property LocalProviderID As %String(%JSONINCLUDE = "inout");

Property ProviderID As %String(%JSONINCLUDE = "inout");

Property StartTime As %String(%JSONINCLUDE = "inout");

Property Reason As %String(%JSONINCLUDE = "inout");

XData AthenaAppointment
{
<Mapping xmlns="http://www.intersystems.com/jsonmapping">
        <Property Name="AppointmentID" FieldName="appointmentid" />
        <Property Name="AppointmentType" FieldName="appointmenttype" />
        <Property Name="AppointmentTypeID" FieldName="appointmenttypeid" />
        <Property Name="Date" FieldName="date" />
        <Property Name="DepartmentID" FieldName="departmentid" />
        <Property Name="Duration" FieldName="duration" />
        <Property Name="PatientAppointmentTypeName" FieldName="patientappointmenttypename" />
        <Property Name="LocalProviderID" FieldName="localproviderid" />
        <Property Name="ProviderID" FieldName="providerid" />
        <Property Name="StartTime" FieldName="starttime" />
        <Property Name="Reason" FieldName="reason" />
</Mapping>
}

Storage Default
{
<Data name="AthenaAppointmentDefaultData">
<Value name="1">
<Value>%%CLASSNAME</Value>
</Value>
<Value name="2">
<Value>AppointmentID</Value>
</Value>
<Value name="3">
<Value>AppointmentType</Value>
</Value>
<Value name="4">
<Value>AppointmnetTypeID</Value>
</Value>
<Value name="5">
<Value>Date</Value>
</Value>
<Value name="6">
<Value>DepartmentID</Value>
</Value>
<Value name="7">
<Value>Duration</Value>
</Value>
<Value name="8">
<Value>PatientAppointmentTypeName</Value>
</Value>
<Value name="9">
<Value>LocalProviderID</Value>
</Value>
<Value name="10">
<Value>ProviderID</Value>
</Value>
<Value name="11">
<Value>StartTime</Value>
</Value>
<Value name="12">
<Value>Reason</Value>
</Value>
<Value name="13">
<Value>AppointmentTypeID</Value>
</Value>
</Data>
<DataLocation>^SERVICESVC2A71.AthenaAppoi8EB1D</DataLocation>
<DefaultData>AthenaAppointmentDefaultData</DefaultData>
<IdLocation>^SERVICESVC2A71.AthenaAppoi8EB1D</IdLocation>
<IndexLocation>^SERVICESVC2A71.AthenaAppoi8EB1I</IndexLocation>
<StreamLocation>^SERVICESVC2A71.AthenaAppoi8EB1S</StreamLocation>
<Type>%Storage.Persistent</Type>
}

}

Here's what I see what I try to implement that class and call the JSON methods. Nothing seems to be translating into my AthenaAppointment Object.

^XVMC(0)="{""date"":""06/27/2022"",""appointmentid"":1214525,""departmentid"":195,""localproviderid"":187,""appointmenttype"":""NEW PATIENT 45"",""providerid"":187,""starttime"":""14:00"",""duration"":45,""appointmenttypeid"":1188,""reasonid"":[""-1""],""patientappointmenttypename"":""New Patient""}
SERVICESVC>set myObject = ##class(%DynamicAbstractObject).%FromJSON(^XVMC(0))

SERVICESVC>zw myObject
myObject={"date":"06/27/2022","appointmentid":1214525,"departmentid":195,"localproviderid":187,"appointmenttype":"NEW PATIENT 45","providerid":187,"starttime":"14:00","duration":45,"appointmenttypeid":1188,"reasonid":["-1"],"patientappointmenttypename":"New Patient"}  ; <DYNAMIC OBJECT>


d AthenaAppointment.%JSONImport(myObject,"AthenaAppointment")

SERVICESVC>zw AthenaAppointment
AthenaAppointment=3@SERVICESVCPKG.Model.AthenaAppointment  ; <OREF>
+----------------- general information ---------------
|      oref value: 3
|      class name: SERVICESVCPKG.Model.AthenaAppointment
| reference count: 2
+----------------- attribute values ------------------
|       %Concurrency = 1  <Set>
|      AppointmentID = ""
|    AppointmentType = ""
|  AppointmentTypeID = ""
|               Date = ""
|       DepartmentID = ""
|           Duration = ""
|    LocalProviderID = ""
|PatientAppointmentTypeName = ""
|         ProviderID = ""
|             Reason = ""
|          StartTime = ""
+-----------------------------------------------------

Any nudges in the right direction would be greatly appreciated!