Hi,
Please provide a screenshot of your Inspector view. There is a good chance you didn’t assign a property and this would be the reason the anchor is not appearing.
ARGameLogic.cs is a script used to assign different events to our action. Make sure you assign the ARNetworkingSceneManager to the Manager property under AR Game Logic Script in Inspector view.
For more information take a look at Shared AR Session & Plane Tracking Video Tutorial and ARGameLogic.cs script issue from the community forums.