You are login with a Skype for Business Server administrative account holding appropriate rights/permissions on a workstation which is joined to the Active Directory domain. Upon executing a #skype4b command on the Control Panel or management shell, you encountered the error below:
Get-CsAddressBookConfiguration : Login failed. The login is from an untrusted domain and cannot be used with Windows authentication.
At line:1 char:1
+ CategoryInfo : NotSpecified: (:) [Get-CsAddressBookConfiguration], SqlConnectionException + FullyQualifiedErrorId : Microsoft.Rtc.Common.Data.SqlConnectionException,Microsoft.Rtc.Management.Internal.GetAddressBookConfigurationCmdlet
If you have recently changed the account’s password, simply lock and unlock the administrative workstation using the updated credentials to fix this issue.