title: Set-ADuser extensionAttribute won't work but things like title will
body: <p>I am writing a simple script that takes an already created user and updates an attribute based on what the admin put in. </p>
  
  <p>The code works just fine if I replace <code>extensionAttribute</code> with for example <code>title</code> or something like that, but it won't with extensionAttributes.</p>
  
  <p>I have tried a few things and other extensionAttributes but the code is so simple and it works with other Attributes. I am guess extensionAttributes require a bit more in the code that I am missing.</p>
  
  <pre><code>$name = Read-Host "AD Logon Name"
  $key = Read-Host "Azure Key"
  Set-ADUser $name -extensionAttribute6 $key -PassThru
  </code></pre>
  
  <blockquote>
    <p>Set-ADUser : A parameter cannot be found that matches parameter name 'extensionAttribute6'</p>
  </blockquote>
  
  <p>Even though it exists it is not finding it.</p>