ERROR <Ens>ErrException: <UNDEFINED>OnProcessInput Error Troubleshooting

I have created the following Task to kick off a Ens.BusinessService to execute a SQL query and process the results

Class OSU.Workday.TerminationsTask Extends %SYS.Task.Definition
{

Parameter TaskName As STRING = "OSU - Workday Termination Update";

Method OnTask() As %Status
{
    #Dim sc as %Status
    #Dim ex as %Exception.AbstractException
    
    set sc = $$$OK

    try{
        // create the service
        #Dim tService As OSU.DataSource.Workday.TermService
        Set tServiceConfigName = "OSU.DataSource.Workday.TermService"
        
        // Call BusinessService
        $$$ThrowOnError(##class(Ens.Director).CreateBusinessService(tServiceConfigName,.tService))
        $$$ThrowOnError(tService.Adapter.OnTask())
        set (tHint) = ""
    }catch ex{
        set tSC = ex.AsStatus()
    }
    quit tSC
}

ClassMethod TestTask()
{
	set tTask = ##class(OSU.Workday.TerminationsTask).%New()
	$$$ThrowOnError(tTask.OnTask())
}

/// Location and Revision of this file in Perforce (Auto-updating)
Parameter SrcVer = "$Id$";

}

and the following Service...

Class OSU.Workday.TerminationService Extends Ens.BusinessService
{

Parameter ADAPTER = "EnsLib.SQL.InboundAdapter";

Parameter REQUESTCLASSES As %String = "EnsLib.SQL.Snapshot";

/// Configuration item to send inbound messages
Property TargetConfig As Ens.DataType.ConfigName [ Required ];

Property Timeout As %Integer;

Parameter SETTINGS = "TargetConfig:Basic:selector?multiSelect=1&context={Ens.ContextSearch/ProductionItems?targets=1&productionName=@productionId},Timeout:Basic";

Method OnProcessInput(pInput As EnsLib.SQL.Snapshot, pOutput As %RegisteredObject) As %Status
{
    #dim tTargetConfig As Ens.DataType.ConfigName
    #dim tTimeout As %Integer
    #dim tElapsedTime As %Numeric = $ZH
    #dim tActivity As %String

    Set tActivity = pHint
    Set pHint = ..%SessionId
    Set tTargetConfig = ..TargetConfig
    Set tTimeout = ..Timeout

    If tTargetConfig = "" {
        Set tStatus = $$$EnsError($$$EnsErrTargetNotSpecified,"TargetConfig")
        Quit
    }
    set req = ##class(OSU.Workday.Messages.WorkdayTerminations).%New()
    set req.EMPLID = pInput.Get("EMPLID")
    set req.MedCtrID = pInput.Get("MedCtrID")
    set req.LastName = pInput.Get("LastName")
    set req.FirstName = pInput.Get("FirstName")
    set req.EFFDT = pInput.Get("EFFDT")
    set req.MiddleName = pInput.Get("MiddleName")
    set req.Gender = pInput.Get("Gender")
    set req.DOB = pInput.Get("DOB")
    set req.NPI = pInput.Get("NPI")
    set req.DoctorNumber = pInput.Get("DoctorNumber")
    set req.VerityID = pInput.Get("VerityID")
    set req.SSN = pInput.Get("SSN")
    set req.IDMID = pInput.Get("IDMID")
    set sc = ..SendRequestSync(tTargetConfig,req)

    // We *always* send back the %SessionId in pHint to allow the caller to track down the message session.
    Set pHint = ..%SessionId
    quit sc
}

/// Location and Revision of this file in Perforce (Auto-updating)
Parameter SrcVer = "$Id$";

}

However, when the Task executes, I am getting 

ERROR <Ens>ErrException: <UNDEFINED>OnProcessInput+2 ^OSU.Workday.TerminationService.1 *pHint -- logged as '23 Mar 2026'
number 1 @'
Set tActivity = pHint'

Can someone help me see my issue?