How to multi-target UWP and Xamarin in F# project?

[xperiandri]

I try to multi-target https://github.com/xperiandri/Elmish.Uno project to UWP and Xamarin.

<Project Sdk="MSBuild.Sdk.Extras/2.0.54">
  <PropertyGroup>
    <TargetFrameworks>netstandard2.0;xamarinios10;monoandroid90;uap10.0</TargetFrameworks>
    <GenerateDocumentationFile>true</GenerateDocumentationFile>
    <!--https://github.com/dotnet/fsharp/issues/7363#issuecomment-519270901-->
    <Deterministic>false</Deterministic>
    <!--<DebugType>portable</DebugType>-->
  </PropertyGroup>
  <ItemGroup>
    <Compile Include="Utils.fs" />
    <Compile Include="Types.fs" />
    <Compile Include="Config.fs" />
    <Compile Include="Binding.fs" />
    <Compile Include="ViewModel.fs" />
    <Compile Include="ViewModelUtilities.fs" />
    <Compile Include="Program.fs" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Elmish" Version="3.0.6" />
    <PackageReference Include="Uno.Core" Version="1.29.0" />
  </ItemGroup>

  <ItemGroup Condition="'$(TargetFramework)'=='xamarinios10' or '$(TargetFramework)'=='monoandroid80' or '$(TargetFramework)'=='monoandroid90' or '$(TargetFramework)'=='netstandard2.0'">
    <PackageReference Include="Uno.UI" Version="2.2.0-dev.171" />
  </ItemGroup>

  <ItemGroup Condition=" '$(TargetFramework)' == 'uap10.0' ">
    <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform " Version="6.2.9" />
  </ItemGroup>

</Project>

For Xamarin I get:

error NETSDK1005: Assets file 'C:\Users\Andrii\Dev\Frebo\Biblioteko\Elmish.Uno\src\Elmish.WPF\obj\project.assets.json' doesn't have a target for 'Xamarin.iOS,Version=v1.0'. Ensure that restore has run and that you have included 'xamarinios10' in the TargetFrameworks for your project.
error NETSDK1005: Assets file 'C:\Users\Andrii\Dev\Frebo\Biblioteko\Elmish.Uno\src\Elmish.WPF\obj\project.assets.json' doesn't have a target for 'MonoAndroid,Version=v9.0'. Ensure that restore has run and that you have included 'monoandroid90' in the TargetFrameworks for your project.

For UWP:

error NU1202: Package FSharp.Core 4.7.0 is not compatible with uap10.0 (UAP,Version=v10.0). Package FSharp.Core 4.7.0 supports:
error NU1202:   - net45 (.NETFramework,Version=v4.5)
error NU1202:   - netstandard2.0 (.NETStandard,Version=v2.0)
error NU1202: Package Elmish 3.0.6 is not compatible with uap10.0 (UAP,Version=v10.0). Package Elmish 3.0.6 supports:
error NU1202:   - net461 (.NETFramework,Version=v4.6.1)
error NU1202:   - netstandard1.6 (.NETStandard,Version=v1.6)
error NU1202:   - netstandard2.0 (.NETStandard,Version=v2.0)

Do you know how that can be fixed?