I have migrated a classic web applications from SharePoint 2010 to SharePoint 2013. The migration went well and everything is working.
But i cannot add any users to the site.
I can find the users from the directory through People Picker but if i click on add it doesn't does anything. it stays idle neither throws error.
If i type the username it doesn't even resolves the username also.
This is a classic authentication based SharePoint 2010 Experience site in 2013
Any ideas.....
kukdai