Skype for Business for iPhone can't receive IM or call notification in sleep mode in Lync Server 2013

Applies to: Lync Server 2013

Symptoms


In a Microsoft Lync Server 2013 environment, you update the Skypefor Business for iPhone client to 6.18.2 or a later version. When theiPhone goes to sleep mode, you may notice that you can't receive any instantmessage (IM) notifications or accept any incoming calls.

Cause


This issue occurs because the Skype for Business for iPhone clientcan't be waken up after the application goes into background in the iPhone.

Resolution


To fix this issue, install the January 2019 cumulative update 5.0.8308.1068 for Lync Server 2013, Web Components Server, and then configure push notifications.