I have cross forest users which I want to add to my SharePoint Enterprise site but the people picker is not able to pick up those users?
Can someone help.
Depending on your ActiveDirectory Trust, you have to configure some stuff in PeoplePicker to be able to browse foreign Forests.
This need still be done with STSADM.EXE in SharePoint 2013, as there are no PowerShell-CMDlets for this.
More Information can be found in Technet: Configure People Picker in SharePoint 2013 https://technet.microsoft.com/en-us/library/gg602075%28v=office.15%29.aspx