I have a SharePoint 2010 farm. I want the ability to add users to groups. We use claims based authentication.
I need to be able to add users who do not yet exist and are not yet registered to groups I have already created. Because it is claims based, and relies on their email address, I know exactly what their username will be when they register. I want to take a whole email list I have and add all the users to the group, such that when they register and first visit the site they immediately have the permissions I have already granted.
Is there any way to do this? I don't want to automatically register them. They must register themselves. I just want to add them before they register.
I am amenable to PowerShell, GUI, etc. Whatever would make this work.