title: How to change multiple users UPN suffix?
body: <p>I'm preparing for a move to office365 and since we have the mydomain.local domain I need to add an alternative UPN (same as my SMTP namespace) so mydomain.com. I added the alternate UPN to my domain and now I want to change multiple users UPN at once.</p>
  
  <p>I select multiple users > right click > properties > account > UPN suffix and select the UPN from the drop-down. When that's done I click OK or Apply and I get following error for all selected user:</p>
  
  <blockquote>
    <p>The specified directory service attribute or value does not exist.</p>
  </blockquote>
  
  <p>When I change it from one user it works without a problem.</p>
  
  <p>My question now is, can someone help me solve tell me why this error is showing or what way I can achieve this.</p>
  
  <p>Thanks</p>