I cannot sign in; I'm getting a sign in failure message

PIN authentication can fail for several reasons, most commonly an invalid extension or invalid PIN.

When PIN authentication fails, a warning message displays:


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Press Ok to open the PIN Authentication screen to sign in again. Any one of the following messages might display:
  • Lync Sign In has failed System Administrator. This message indicates that something is wrong with the network. When you receive this message, speak to your administrator.
  • Lync Sign In has failed Invalid login credentials. This message indicates that the user credentials you entered are incorrect. Try entering your credentials again and if sign in still fails, speak to your administrator.
  • Lync Sign In has failed Please update Sign In Information. This message is rarely expected, and indicates a problem with the generation of certificate signing request (CSR) publishing the certificate.