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I'm afraid I can't share my full project. I can provide a blank project with only game4automation & Visual Effect Graph because the same issue is showing in an empty project with only game4automation & Visual Effect Graph.

Hi,
I am also facing the same issue "Library\PackageCache\com.unity.visualeffectgraph@7.4.3\Editor\Models\Blocks\Implementations\Orientation\Orient.cs(338,31): error CS0433: The type 'InvalidEnumArgumentException' exists in both 'System.Private.ServiceModel, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

My project runs in Unity LTS version 2019.4.7f1. I am not using URP or HDRP as I do not require both. But I am using "Visual Effect Graph" which is unavoidable for my project. When I imported game4automation to my project I am facing the above issue. I also require OPCUA4UNITY for my project. Is there any solution?