Configure People Picker for Multi-Domains(or Cross Domains), Forests Environments
If you have SharePoint environment in new domain(example: Main) and also have old sharepoint in other domain(example: Constco) and want to bring Old sharepoint users into new SharePoint then follow the below steps Open Two way/ One way Trust between Two Domain controllers (i.e. Old and New) 1) Open the proper ports between SharePoint 2019 servers (except Database servers) and Old Domain Controler (Constco) 2) exectue the below command in all servers in New sharepoint environment stsadm -o setapppassword -password Test$123 replace Test$123 to your own passowrd 3) exectue the below command in web servers only in New sharepoint environment stsadm -o setproperty -pn peoplepicker-searchadforests -pn peoplepicker-searchadforests -pv "forest: Main.Corp ;forest: constco.corp , constcoDomain \ loginname ,' password' " -url " SharePoint web URL " Note: Replace Main to your new domain constcoDomain to old domain