Public/Get-ADPManagerAOID.ps1

function Get-ADPManagerAOID {
    <#
    .SYNOPSIS
        Get a user's Manager's AOID from ADP

    .DESCRIPTION
        Get a user's Manager's AOID from ADP

    .PARAMETER ADPObject
        Object which holds the Manager's AOID

    .EXAMPLE
        Input Object: ADP Object
        Return String: <Manager's AOID>

    .NOTES
        This is used when passing the full adp worker object from ADP's APID

    .FUNCTIONALITY
        Powershell Language
    #>

    [CmdletBinding()]
    param (
        [Parameter( Mandatory = $true,
            Position = 0,
            ValueFromPipeline = $true
        )]
        $ADPObject
    )

    $localManagerAOID = $null

    $localManagerAOID = ($ADPObject.workAssignments | Where-Object { $_.primaryIndicator }).reportsTo.associateOID

    return ( $localManagerAOID | Get-ValidADPReturn )

}