您能够看到添加的用户在网站集上可用吗?通过尝试在"People Picker"中输入他们的名字?如果不可用，

Are you able to see the added users are available on the site collection ? by trying to typing their name in People Picker ? If not available ,

请通过进入services.msc检查用户配置文件服务和同步服务是否连续运行，并检查是否已将Forefront Identity Service设置为自动启动.

Please check whether the User Profile Service and Synchronization services are running continuously and also check the forefront identity service has been set to start automatically by going into services.msc