blueprintAuthorityOnly not callable in level blueprint

Hi all,

Why is the blueprintAuthorityOnly function not callable from the level blueprint?

UCLASS(BlueprintType)
class MyClass
{

UFUNCTION(BlueprintAuthorityOnly)
void MyFunction();
}

In the level blueprint, I have a valid instance of MyClass and I can’t call MyFunction(). If I change the specifier to BlueprintCallable, everything works fine.

What do I miss?

Thanks,