Filter issue

VasilMichev 

Thanks for testing and confirming. That's the odd thing, I'm 99.99% certain there's nothing wrong here.

The top of the script is as so:

$DataArray = @()
$ADUsers = Get-AzureADUser -All:$true
foreach($User in $ADUsers)
{
    $Creation = Get-AzureADUserExtension -ObjectId $User.UserPrincipalName
    $UserUPN = $User.UserPrincipalName
    $UserDisplayName = $User.DisplayName
    $LastLogin = Get-AzureADAuditSignInLogs $true -Top 1 -Filter "userDisplayName eq '$UserDisplayName'" -ErrorAction SilentlyContinue | Select createdDateTime

....

Of course there's more to it but you can seen from the example how the variables are being populated. See anything there that pops out?

I remove the -All switch from it as well. Good catch, thanks.