However, the cmdlet will return information for both online users and on-premises users. If you have a hybrid or 'split domain' deployment (that is, a deployment in which some users have accounts homed on Skype for Business Online while other users have accounts homed on an on-premises version of Skype for Business Server 2015) keep in mind that the Get-CsOnlineUser cmdlet only returns information for Skype for Business Online users. If you do not know your tenant IDs you can return that information by using this command: That command will limit the returned data to user accounts belong to the tenant with the TenantId 'bf19b7db-6960-41e5-a139-2aa373474354'. However, if you have multiple you can return users from a specified tenant by using the Filter parameter and a command similar to this:

Note that the Get-CsOnlineUser cmdlet does not have a TenantId parameter that means you cannot use a command similar to this in order to limit the returned data to users who have accounts with a specific Microsoft Teams or Skype for Business Online tenant:

The returned information includes standard Active Directory account information (such as the department the user works in, his or her address and phone number, etc.) as well as Skype for Business Server 2015 specific information: the Get-CsOnlineUser cmdlet returns information about such things as whether or not the user has been enabled for Enterprise Voice and which per-user policies (if any) have been assigned to the user. The Get-CsOnlineUser cmdlet returns information about users who have accounts homed on Microsoft Teams or Skype for Business Online. In this article Syntax Get-Cs Online User Returns information about users who have accounts homed on Microsoft Teams or Skype for Business Online.

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