StyleCop on Azure Pipeline dotnet publish, The "StyleCopTask" task could not be loaded from the assembly

Question

I keep getting the following error on the pipeline when trying to do "dotnet publish". I'm trying to run this on an ubuntu environment.

Error from Azure pipeline

This is the full error line:

/home/vsts/.nuget/packages/stylecop.msbuild/6.2.0/build/StyleCop.MSBuild.targets(101,5): error MSB4062: The "StyleCopTask" task could not be loaded from the assembly /home/vsts/.nuget/packages/stylecop.msbuild/6.2.0/build/../tools/StyleCop.dll. Could not load file or assembly 'System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. The system cannot find the file specified. [/home/vsts/work/1/s/src/MyServiceManager.NotificationService.API/MyServiceManager.NotificationService.API.csproj]

Any idea what's up with StyleCop?

Build on local machine is fine. Build on Azure pipeline breaks.

Tried changing StyleCop.MSBuild versions. Tried changing to MSBuild instead of "dotnet" command