Function only diplays properties once - powershell

Question

I have a function that for some reason, just seems to only display $Properties once, no matter how many users are passed to the script. Tried to throw in just the $user passed into the script to display but, that too only displays once. Not too sure why it's doing this as I have exhausted ideas on what it may be:
Function Set-DRAUserProperty {
Param (
[Parameter(Mandatory=$true,
ValueFromPipeline=$true,
ValueFromPipelineByPropertyName=$true)]
[string[]]$UserName,
$Company,
$Department,
$Name,
$O,
$PhysicalDeliveryOfficeName,
$TelephoneNumber,
$Title
)
DynamicParam
{
if ($UserName.Split(',').Count -le 1) {
$displayNameAttribute = New-Object System.Management.Automation.ParameterAttribute
$displayNameAttribute.Mandatory = $false
$attributeCollection = new-object System.Collections.ObjectModel.Collection[System.Attribute]
$attributeCollection.Add($displayNameAttribute)
$displayNameParam = New-Object System.Management.Automation.RuntimeDefinedParameter('DisplayName', [string], $attributeCollection)
$paramDictionary = New-Object System.Management.Automation.RuntimeDefinedParameterDictionary
$paramDictionary.Add('DisplayName', $displayNameParam)
$paramDictionary
}
}
Begin
{
$OrgBoxOu = "*OU=xxxxxxxxx"
$Parameters = $PSBoundParameters
$Properties = #{}
}
Process
{
foreach ($User in $UserName)
{
try {
$SelectedUser = Get-ADUser -Identity $User -Properties DisplayName
if ($SelectedUser) {
$Parameters.GetEnumerator() | Where-Object -FilterScript {$_.Key -ne 'UserName'} |
ForEach-Object -Process `
{
if ($_.Key -eq 'DisplayName' -and $SelectedUser.DistinguishedName -like $OrgBoxOu) {
if ('FirstNamePreferred' -in $Properties.Keys) {
Continue
}
else {
$Properties.Add($_.Key, $_.Value)
$Properties.Add('FirstNamePreferred', $_.Value)
}
}
else {
if ($_.Key -in $Properties.Keys) {
Continue
}
else {
$Properties.Add($_.Key, $_.Value)
}
}
}
$Properties.GetEnumerator()
#Set-DRAUser -Identifier $SelectedUser.DistinguishedName -Properties $Properties #DRA_Server_Splat -ErrorAction Stop
}
else {
Write-Host -Object "No valid member selected!"
}
}
catch {
Write-Host -Object "ERROR: $($_.Exception.Message)" -ForegroundColor Red -BackgroundColor Black
continue
}
}
}
End { }
}
When running the function,
Set-DRAUserProperty -UserName Abe,Abe -Company ssc
. . . the output is only displayed once:
Name Value
---- -----
Company ssc
What i'm tring to achieve is having the values be splatted onto another cmdlet, but it won't work as long as my $Properties hashtable only displays once. So expected output would be it display the hashtable for each user that's been passed to the function:
Name Value
---- -----
Company ssc
Name Value
---- -----
Company ssc
Just looking for some fresh eyes that can point me in the right direction and/or, shed some light on what might be happening (wrong). Not sure what could be causing the issue so can't pin-point it to a specific code section.
Please edumecate me:)

Answer 1

Solution was to define the hashtable inside the foreach loop instead of inside the begin { ... } block:
foreach ($User in $UserName)
{
$Properties = #{}
....
....
}
But if you want to understand why it was not working before?, this is your hint:
if ($_.Key -in $Properties.Keys) {
'{0} is in $Properties.Keys :)' -f $_.Key
Continue
}
Which yields:
Name Value
---- -----
Company ssc
Company is in $Properties.Keys :)
Company is in $Properties.Keys :)
And this only happens because $Properties is the same on each iteration (because it was defined in the begin { ... } block).