Using UPN suffix for user sign-in

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  hi,

   

  i have a internal dns name example.local but for the users i have configured a UPN suffix example.com. I dont want the users to have to sign in with user@example .local but with user@example.com . When i configure a user for communication then i check the chekbox use UPN suffix. But i still cant login with that user it and when i go to the properties it says the domain is not available. 
  How can i configure this?

   

  Greetings

  Wednesday, April 18, 2007 8:10 AM