Xamarin.Forms Android project builds and runs locally on two machines; fails in Visual Studio Team Services - xamarin.forms

Question

I have a solution that contains an ASP.Net Core web-api project, a Xamarin.Forms app with an Android, iOS and Shared Netstandard library project, along with 5 other NetStandard libraries that are shared between the Xamarin app and the ASP.Net Core app.
I am able to compile and run the Android app on two different local machines, one being Windows 10 and another being macOS Sierra. When I have Visual Studio Team Services (VSTS) clone the repository from BitBucket and build the Android project, it fails to build because of Android resource file issues. I assume the problem is that I don't have VSTS configured correctly, since this runs on two different machines for me without issue. I'm not sure what I have misconfigured in VSTS to solve the issue.
I have a complete reproducible project available for download for uploading to VSTS if anyone needs that.
The build output is large, so I've included the errors themselves below with a link to the entire build output from VSTS.
"d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj" (PackageForAndroid target) (1) ->
(_UpdateAndroidResgen target) ->
Resources\values\styles.xml(2): error APT0000: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.DarkActionBar'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(3): error APT0000: Error: No resource found that matches the given name: attr 'colorAccent'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(2): error APT0000: Error: No resource found that matches the given name: attr 'colorPrimary'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(2): error APT0000: Error: No resource found that matches the given name: attr 'colorPrimaryDark'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(2): error APT0000: Error: No resource found that matches the given name: attr 'windowActionBar'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(4): error APT0000: Error: No resource found that matches the given name: attr 'windowActionModeOverlay'. >[d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(2): error APT0000: Error: No resource found that matches the given name: attr 'windowNoTitle'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(4): error APT0000: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.Dialog'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(4): error APT0000: Error: No resource found that matches the given name: attr 'colorAccent'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(5): error APT0000: Error: No resource found that matches the given name: attr 'colorAccent'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(4): error APT0000: Error: No resource found that matches the given name: attr 'colorPrimary'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(4): error APT0000: Error: No resource found that matches the given name: attr 'colorPrimaryDark'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
Resources\values\styles.xml(5): error APT0000: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.NoActionBar'. [d:\a\1\s\dotnet\Apps\Mobile\Mobile.Android\Mobile.Android.csproj]
The following is my VSTS Build Definition:
NuGet Restore
Android build
Definition Options
What have I got configured incorrectly that's causing this to fail with the Android resources in VSTS, but not when I build locally?
Local Environment
Windows
Operating System: Windows 10
Visual Studio 2017 15.3 Preview 3
dotnet --version: 1.1.0-preview1-005051
Mac
Operating System: Sierra 10.12.5
Visual Studio for Mac Community - 7.1 Preview (build 583)
Alpha Channel
dotnet --version: 2.0.0-preview3-006815
App Info
Xamarin.Forms shared NetStandard library packages:
Xamarin.Forms: 2.3.5.256-pre6
NetStandard.Library: 1.6.1
Xamarin.Android packages
Xamarin.Android.Support.Design: 25.3.1
Xamarin.Android.Support.v4: 25.3.1
Xamarin.Android.Support.v7.AppCompat: 25.3.1
Xamarin.Android.Support.v7.CardView: 25.3.1
Xamarin.Android.Support.v7.MediaRouter: 25.3.1
Xamarin.Android Framework
MonoAndroid, Version=v7.1
Minimum Android Version: 4.4, API Level 19
Target Android Version: 7.1, API Level 25
Target Framework: 7.1
Final thoughts
I am using project.json for the Xamarin.Android and Xamarin.iOS projects to maange the nuget packages, instead of packages.config, so I can use transitive dependencies. Is there something specific about my two environments that I need to configure in VSTS? I'm using two different versions of dotnet core as well without any issues, so I'm really confused what's going on here.

Answer 1

Use "Visual Studio Build" task instead of "Xamarin.Android" task to run the build. Add /t:PackageForAndroid argument in the task if you want to generate apk package.