Hi.
Please read the documentation carefully: https://docs.sonarqube.org/display/SCAN/Analyzing+with+SonarQube+Scanner+for+MSBuild
You are executing MSBUild.SonarQube.Runner.exe (...) /t:Rebuild. The /t:Rebuild is a parameter of msbuild.exe (and not from MSBUild.SonarQube.Runner.exe), you’re executing the wrong command.