Cause
This issue occurs because Microsoft Skype for Business Server 2015 does not recognize the device that uses a Windows Phone 8.1 user agent string to emulate as an Android 4.0 or Apple iOS 7 device.
Resolution
To resolve this issue, install the June 2015 cumulative update 6.0.9319.55 for Skype for Business Server 2015 (Web Components Server).
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
