Xbox UWP – Unable to Activate Windows Store App – Error 0x8004090a

Building and deploying UWP apps on Xbox is frustrating – every time I come back to it I get caught out by things that should just work. The one that always seems to get me is that you have to be signed in on the Xbox. This used to not be a problem because Visual … Continue reading “Xbox UWP – Unable to Activate Windows Store App – Error 0x8004090a”


Unhelpful ‘Unable to activate Windows Store app’ Error

Building and deploying UWP apps on Xbox is frustrating – every time I come back to it I get caught out by things that should just work. The one that always seems to get me is that you have to be signed in on the Xbox. This used to not be a problem because Visual Studio used to recognise this issue and provide you a nice reminder – I think it was in the Output window but can’t be sure for certain.

I just attempted to debug an app on the Xbox from the latest version of Visual Studio (both preview and stable) and got the following completely unhelpful error message:

Unable to activate Windows Store app 'XXX.YYYYYYYY_ZZZZZZZZApp'. The activation request failed with error 'Operation not supported. Unknown error: 0x8004090a'.

After rebuilding, cleaning the solution, restarting the Xbox and a variety of other things, I remembered to check that a user was signed in on the Xbox. Sure enough it wasn’t and sure enough, signing in, fixed the activation error.

If you come across this error, make sure you’re signed into an account on the Xbox!!!

Solved: Unable to Run Windows (UWP) Application from Visual Studio 2019

Over the last 24hrs I’ve had to setup a new dev machine from scratch. After installing all the bits and pieces I need to test out to make sure I can build and deploy apps to Android, iOS and Windows. After creating a new Xamarin.Forms application I set the UWP head project to be the … Continue reading “Solved: Unable to Run Windows (UWP) Application from Visual Studio 2019”

Over the last 24hrs I’ve had to setup a new dev machine from scratch. After installing all the bits and pieces I need to test out to make sure I can build and deploy apps to Android, iOS and Windows. After creating a new Xamarin.Forms application I set the UWP head project to be the startup project and hit run….. and waited….. and waited….. and waited.

After seemingly forever there was an error that appeared in the bottom status bar. Not in the Output window, and actually the build was still going. It reads “Failed to download package ‘runtime.win10-x64.Microsoft.Net.Native.SharedLibrary.2.1.8’ from ‘https://api.nuget.org/v3-flatcontainer/runtime.win10-x64.microsoft.net.native.sharedlibrary/2.1.8/runtime…..”

I’m sure that there are going to be readers out there that will answer this by saying – download nuget and run a manual restore; or call dotnet restore from the package manager. But seriously??? why am I having to do this??? Why it Visual Studio so broken that I can just run the UWP head project of a new Xamarin.Forms application.

I went into manage nuget packages and upgraded the Microsoft.NETCore.UniversalWindowsPlatform package.

After a 20minute wait, it eventually upgraded the package. There after I was able to build and run my UWP application.

Ironically I complained about this back in August last year (the previous time I had to setup a replacement device).

Amazing that in all that time, Microsoft can’t work out how to make new installed, new project, run…. just work, like it should.