Cannot add groups to Lync 2013 contact list

Question

Just recently we've had reports (and I can verify this myself) in the Lync 2013 client if you add a group to the contact list, it says "Cannot perform this action, and the cause is unknown.  Contact your support team to investigate this problem."
 There is no issue adding individual users to the lync contact list, just if you search for a group (for example, Accounting) and this group is an easy way to add lets say 5 accounting associates to lync instead of individually adding each person at a
time.
Any idea how to diagnose this?  In checking my Lync client version I get this:
Microsoft Lync 2013 (15.0.4675.1000) MSO (15.0.465.1002) 32-bit
Part of Microsoft Office Professional Plus 2013
The server is Lync 2013 as well.
Exchange 2013 is used on premise if that matters. 
Get-CsWebServiceConfiguration
Identity : Global
TrustedCACerts : {}
CrossDomainAuthorizationList : {}
MaxGroupSizeToExpand : 100
EnableGroupExpansion : True
UseWindowsAuth : Negotiate
UseCertificateAuth : True
UsePinAuth : True
UseDomainAuthInLWA : True
AllowAnonymousAccessToLWAConference : True
EnableCertChainDownload : True
InferCertChainFromSSL : True
CASigningKeyLength : 2048
MaxCSRKeySize : 16384
MinCSRKeySize : 1024
MaxValidityPeriodHours : 8760
MinValidityPeriodHours : 8
DefaultValidityPeriodHours : 4320
MACResolverUrl :
SecondaryLocationSourceUrl :
ShowJoinUsingLegacyClientLink : False
ShowDownloadCommunicatorAttendeeLink : False
AutoLaunchLyncWebAccess : True
ShowAlternateJoinOptionsExpanded : False
UseWsFedPassiveAuth : False
WsFedPassiveMetadataUri :
AllowExternalAuthentication : True

Answer 1

Hi KJSTech1,
To better understand the issue, I would like to collect the following information for troubleshooting:
1. Group expansion is enabled and disabled by using the
Set-CsWebServiceConfiguration cmdlet. Please make sure
EnableGroupExpansion
parameter is set to
true .
http://technet.microsoft.com/en-us/library/gg398396.aspx
2. Can you run the command
Test-CsGroupExpansion to test the ability of a user to employ group expansion ?
http://technet.microsoft.com/en-us/library/gg399009.aspx
Best regards,
Eric