I have managed to resolve the error above… but now am back to being unable to authenticate the app…
Error DEP6957 : Failed to connect to device ‘169.254.112.171’ using Universal Authentication. Please verify the correct remote authentication mode is specified in the project debug settings. 0x8007274C: The network event being waited on triggered an error. CubeDemo2
If you’re installing Visual Studio 2017, make sure that you choose the Universal Windows Platform development workload. If you’re a C++ developer, make sure that you also select the C++ Universal Windows Platform tools checkbox in the Summary pane on the right, under Universal Windows Platform development. It’s not part of the default installation.
If you’re installing Visual Studio 2015 Update 3, ensure that the Universal Windows App Development Tools check box is selected.