Resharper Command Line Tools not able to build .NET Core 3.0 app

I am trying out Resharper Command Line Tools (inspectcode to be exact) for a github actions application; and when I try and use it for a .net core 3.0 test project, I get: 

The current .NET SDK does not support targeting .NET Core 3.0. Either target .NET Core 1.1 or lower, or use a version of the .NET SDK that supports .NET Core 3.0. at (112:5)

Very much unsure on what's causing this, I have multiple SDK's that support .NET Core 3.0 installed and working.