"Device is not allowed to join" when you click a Skype for Business meeting URL on a Windows Phone 8.1 device Content provided by Microsoft Applies to: Skype for Business Server 2015 Select Product Version All Products 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). Third-party information disclaimerThe 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. Last Updated: Jun 23, 2015 Did this solve your problem? Yes No Tell us what we can do to improve the article Submit Thanks! Your feedback will help us improve the support experience.