Casting actor to interface returns null; calling ImplementsInterface returns true

Development Programming & Scripting UI
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1

When I run this code here:

AActor* actor = hitResult.GetActor();
IUnit* IUnitActor = Cast<IUnit>(actor);
    
bool bIsIUnit = actor->GetClass()->ImplementsInterface(UUnit::StaticClass());

IUnitActor is null, while bIsIUnit is true.
The actor doesn’t implements the interface in C++ code, but in his blueprint editor.
Why does the cast returns null and how can I call functions from the interface on the actor?
Or do I need to create a C++ class that directly implements the Interface?

2

Found a how-to on Epic’s WIKI :
https://wiki.unrealengine.com/How_To_Make_C%2B%2B_Interfaces_Implementable_By_Blueprints%28Tutorial%29