Lots of things are blocked by default for UWP.  You have to enable the capabilities needed by your app in "Package.appxmanifest"

Some can be altered using the Capabilities tab of this file in visual mode, but others require you to edit it in code mode (right click > view code)

Full list of capabilities

https://msdn.microsoft.com/en-gb/windows/uwp/packaging/app-capability-declarations