Search for Lync users by name

Hi,

How is it possible to search for federated users using their name?

I am developing a WPF app to integrate with Lync so far what I need is working fine except for searching for contacts using <g class="gr_ gr_104 gr-alert gr_gramm gr_inline_cards gr_run_anim Grammar only-ins doubleReplace replaceWithoutSep" data-gr-id="104" id="104">name</g>. I can search by SIP or Email, but not by name. At the same time, using Lync Client I can search for them by name.

In my organization, we have 1 AD forest, under it, we have domains. Lync is installed per domain and all Lync users are AD users at the same time and a federation is established between those domains.

I am following this example here:

https://msdn.microsoft.com/en-us/library/office/dn391639.aspx

Thanks