We have a Lync server 2013 which is been joined to say example LyncVM01.test.com; and we have other domains like test1.com,test2.com,
So when users of all the domains can able to enable in the Lync control panel, but users from test.com can able to login from anywhere by logging automatic configuration
But users from domin test1.com are unable to login with automatic configuration but can able to login by manual configuration by giving the lyncpool.test.com
But when we are giving automatic configuration its says Can’t sign in to Lync ( Lync couldn’t find a Lync Server for test1.com.There might be an issue with the Domain Name System(DNS) configuration for your domain. Please contact your support team.