Visual Studio Build Tools fails to recognize "net5.0-windows"

Is it possible to build a .NET 5 project with the Visual Studio Build Tools? Or is my installation not working?

Note: I can't use the dotnet.exe, since i have to build with the WiX-Toolset.

Installed:

• Microsoft (R)-Build-Engine, Version 16.7.0+b89cb5fde für .NET Framework
• .NET SDK (gemäß "global.json"): Version: 5.0.100 Commit: 5044b93829

msbuild.exe used from C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\MSBuild\Current\Bin

Error:

 C:\Program Files\dotnet\sdk\3.1.403\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.TargetFrameworkInference.targets(93,5): error NETSDK1013: Der TargetFramework-Wert "net5.0-windows" wurde nicht erkann
t. Unter Umständen ist die Schreibweise nicht korrekt. Andernfalls müssen die Eigenschaften TargetFrameworkIdentifier und/oder TargetFrameworkVersion explizit angegeben werden. [C:\GitLab-Runner\builds
\mq82bps2\0\capps\developer\mfinder\MFinder\MFinder.csproj]

Also the msbuild.exe searches in the path C:\Program Files\dotnet\sdk\3.1.403\ and not C:\Program Files\dotnet\sdk\5.0.100\. Any hints on that?

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFramework>net5.0-windows</TargetFramework>
    <UseWPF>true</UseWPF>