Unable to access mapped folder directory that was created with PowerShell script

Hello, I recently got help from EE creating a script that will configure NTFS permissions on a directory.

Here is the link to that previous topic, http://www.experts-exchange.com/Programming/Languages/Scripting/Powershell/Q_28687233.html.

Scenario
My script creates a new directory on the network share and then assigns NTFS Modify permissions for the end user.

Problem
The problem is that after the folder is created and NTFS Modify permissions assigned, the user is unable to access the mapped directory. When trying to access the mapped directory, the following message is seen:


Work Around
After the script creates the directory and assigns NTFS Modify permissions to the end user it won't open. However, if I then go into the directory properties and 'toggle' the Modify check box (uncheck then check it back again) and hit Apply. Viola! The end user can now access the mapped directory.

Help
I need help figuring out how to get my script to work the first time with creating the directory and permissions to Modify for an end user and it not requiring me to go toggle the permissions. Why doesn't the directory recognize the location until I toggle the permissions?

function Set-Permission {
<#
.Synopsis
   Manage NTFS permissions on a directory and it's child items.
.DESCRIPTION
   Long description
.EXAMPLE
   Set-Permission -dirPath '\\my-server\user-share\joe.user' -samAccountName joe.user -accessLevel Modify -Verbose

   This will apply Modify permissions for samAccountName joe.user to a network share directory called 'joe.user' and it's child items
.EXAMPLE
   Another example of how to use this cmdlet
.INPUTS
   Inputs to this cmdlet (if any)
.OUTPUTS
   Output from this cmdlet (if any)
.NOTES
   General notes
.COMPONENT
   The component this cmdlet belongs to
.ROLE
   The role this cmdlet belongs to
.FUNCTIONALITY
   The functionality that best describes this cmdlet
#>

    [CmdletBinding()]
    [OutputType([String])]
    Param (
        # Param1 help description
        [Parameter(Mandatory=$true,Position=0)]
        [Alias("Path")]
        [string]
        $dirPath,

        # Param2 help description
        [Parameter(Mandatory=$true,Position=1)]
        [string]
        $samAccountName,

        # Param3 help description
        [Parameter(Mandatory=$true, Position=2)]
        [ValidateSet("Modify")]
        [string]
        $accessLevel,
        
        # Param4 help description
        [Parameter(Mandatory=$false)]
        [string]
        $domain = 'My_Domain'
    )
    Begin {
        $domainAccount = $domain + "\" + $samAccountName
        $inheritanceFlags = "ContainerInherit, ObjectInherit"                     
        $propagationFlags = "None"                    
        $accessControlType = "Allow"

        $AccessRule = New-Object System.Security.AccessControl.FileSystemAccessRule(
                        $domainAccount,$accessLevel,$inheritanceFlags,$propagationFlags,$accessControlType)
        
        Write-Verbose 'Print New Access Rule object'
        $AccessRule

        # Saving parent folder directory into variable
        $Parent = gi $dirPath | where {$_.psIsContainer -eq $true}
        $pFN = $Parent.FullName

        Write-Verbose 'Access Control List of parent folder before applying new rules'
        $pFN
        $oldacl = Get-Acl $Parent
        $oldacl |select accesstostring |fl
    } # \Begin
    Process {
        Write-Verbose "Applying $samAccountName $accessLevel permissions to parent $pFN"
        Add-Access -Path $Parent -Account $domainaccount -AccessRights $accesslevel 

        Get-ChildItem -path $dirPath -Recurse | 
            ForEach-Object { 
                $fnDir = $_.FullName
                Write-Verbose "Applying $samAccountName $accessLevel permissions to child $fnDir"
            }# \ForEach
        Get-ChildItem -path $dirPath -Recurse | Get-NTFSAccessInheritance | 
        Where-Object { -not $_.InheritanceEnabled } | Enable-NTFSAccessInheritance -PassThru
    } # \Process
    End {
        Write-Verbose 'New permissions have been set'
        get-childitem -Path $dirPath -Recurse | get-acl | out-gridview
    }# \End
} 

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