Private Sub _save_Click(sender As Object, e As EventArgs) Handles _save.Click
    Dim newGroupName As String = _groupName.Text
    CheckPrimarySmtpExOnline(newGroupName)
End Sub

Private Function CheckPrimarySmtpExOnline(newGroupName As String) As Boolean
    Dim _ExOnlineAppId As String = ""
    Dim _ExOnlineCert As String = ""
    Dim _result As Boolean = False

    Try
        Dim initialSessionState As InitialSessionState = InitialSessionState.CreateDefault()
        Dim modules As String() = {"ExchangeOnlineManagement"}
        initialSessionState.ImportPSModule(modules)

        Dim runspace As Runspace = RunspaceFactory.CreateRunspace(initialSessionState)
        Dim powershell As System.Management.Automation.PowerShell = System.Management.Automation.PowerShell.Create()
        powershell.Runspace = runspace
        runspace.Open()
        Dim myScript As String = """
                    Param (
                            [Parameter(mandatory=$true)]
                            [string]$ExOnlineAppID,
                            [string]$ExOnlineCert,
                            [string]$name
                    )
                    try {
                        Set-Executionpolicy -ExecutionPolicy RemoteSigned -Scope Process -Force
                        $splat = @{
                            appid = $ExOnlineAppID
                            Organization = 'myorg.onmicrosoft.com'
                            CertificateThumbprint = $ExOnlineCert
                            CommandName = @('Get-Recipient', 'Get-Mailbox', 'New-Mailbox', 'Add-MailboxPermission', 'Remove-MailboxPermission')
                            Showbanner =  $false
                            ErrorAction = 'Stop'
                        }
                        Connect-ExchangeOnline @splat

                        $Recipient = Get-Recipient [email protected] | Select PrimarySmtpAddress
                    }
                    catch {
                        $PSItem | Export-CLIXML 'D:..error.xml'
                    }
                    
                    Return $Recipient.PrimarySmtpAddress

                    Disconnect-ExchangeOnline -Confirm:$false                        
            """
        powershell.AddScript(myScript)
        powershell.AddParameter("ExonlineAppID", _ExOnlineAppId)
        powershell.AddParameter("ExOnlineCert", _ExOnlineCert)
        powershell.AddParameter("name", newGroupName)
        Dim results As Collection(Of PSObject) = powershell.Invoke(Nothing)
        If results.Count > 0 Then
            Dim firstResult As PSObject = results(0)
            If firstResult IsNot Nothing Then
                _result = True
            End If
        End If
    Catch ex As Exception
        Throw New Exception("Error checking primary SMTP address in Exchange Online", ex)
    End Try
End Function

So I’m trying to implement in an existing app that when you try to create a new group this checks if the email which will be applied to this is not present in ExchangeOnline.

I test only the script in PS and it’s retrieving the PrimarySmtpAddress(if present).

The issue is when I store the PSObject in results variable… I’m not capable to find the value for primarysmtpaddress in this PSObject. It returns results

So the validation I’m doing always finds something, always returns true. I tried some variations but the return types are always the same.

Is there any way to do this validation? Thanks in advance.