A little more digging revealed the solution.
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UNavigationSystem::SimpleMoveToLocation is marked deprecated in the API https://api.unrealengine.com/INT/API/Runtime/Engine/AI/UNavigationSystem/SimpleMoveToLocation/index.html
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Use of the UAIBlieprintHelperLibrary::SimpleMoveToLocation solved the issue but you will need to include AIModule in the C++ dependencies, update your ProjectName.Build.cs
PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "HeadMountedDisplay", "AIModule" });
Hope this helps others in the future.