EWS - Get current user (sender) contact information vb.net

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VB

EWS

I'm currently developping a program that will serve to send emails via company's EWS. the code for sending the message works perfectly but i also need to get some data about the sender of the email. It means, when a user sends the email to me, I need to see his position and address. I'm struggling for more then a week to find a way to define the sender in the code and his contact details. And still nothing found so far.

Will appreacite your helf!

My code so far:

Dim url As String = "https://.../ews/Exchange.asmx"
    exch.Url = New System.Uri(url)
    exch.UseDefaultCredentials = False
    exch.Credentials = New System.Net.NetworkCredential(TextBox2.Text, TextBox1.Text)
    ' exch.AutodiscoverUrl("myemail")
    'exch.ResolveName("", ResolveNameSearchLocation.ContactsThenDirectory, True)
    Dim message As New EmailMessage(exch)
    message.Subject = "Новое заявление - " & ComboBox1.SelectedItem
    message.Body = "Добрый день!" & vbNewLine & vbNewLine & "Прошу обработать заявление - " & ComboBox1.SelectedItem
    For Each f In attfiles
        message.Attachments.AddFileAttachment(f)
    Next
    message.ToRecipients.Add(email)
    message.SendAndSaveCopy()