The Lync/Skype client that could not sign in

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So its been a busy few weeks.
Just to keep me on my toes we had an issue with a skype/lync client that couldnt sign in. The client just sat at 'attempting to contact server' with no error message.

Test-CSClientAuthentication to the rescue. Although you do need to have the user close by for authentication.

To cut a long story short - Active Directory attribute DisplayName had hidden line feed/carriage return characters.
Once these were removed the client signed straight in.

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