Article ID: 2637105 - View products that this article applies to.
Consider the following scenario:
Lync was unable to sign in. Please verify your logon credentials and try again. If the problem continues, please contact your support team.
This issue occurs because the Session Initiation Protocol (SIP) uniform resource identifier (URI) of the user is not updated when the UPN of the user is changed. Therefore, the SIP address does not match the UPN when the user tries to sign in.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2670326/ )Description of the cumulative update for Lync 2010: February 2012
Note After you apply the update, the user will receive the following error message:
New sign-in address? Looks like the sign-in address you entered doesn’t exist. You can try a different sign-in address or contact support to update your sign-in address in the system.
For more information about the SIP URIs, visit the following Microsoft website:
General information about the SIP URIs