Can't trigger callback USphereComponent collision

New to UE4 and C++. I am trying to get some basic collision/proximity code working. I can see the ProxSphere in blueprint editor and the sphere is visible in the editing viewport. When I run the scene it logs out the “NPC INIT” message from the constructor, but I can’t seem to be able to get the Prox function to run when player character
enters the sphere.

NPC.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "GameFramework/Character.h"
#include "NPC.generated.h"

UCLASS()
class GOLDENEGG_API ANPC : public ACharacter
{
    GENERATED_BODY()

■■■■■:
    // The sphere that the player can collide with to get item
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Collision)
    USphereComponent* ProxSphere;


   ANPC();

    UFUNCTION()
    void Prox(class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);

};

NPC.cpp

// Fill out your copyright notice in the Description page of Project Settings.

#include "GoldenEgg.h"
#include "NPC.h"
#include "Avatar.h"
#include "MyHUD.h"

// Sets default values
ANPC::ANPC()
{
    UE_LOG(LogTemp, Warning, TEXT("NPC INIT"));
    ProxSphere = CreateDefaultSubobject<USphereComponent>(TEXT("Proximity Sphere"));
    ProxSphere->InitSphereRadius(120.0f);
    ProxSphere->AttachParent = RootComponent;
    ProxSphere->OnComponentBeginOverlap.AddDynamic(this, &ANPC::Prox);
}

void ANPC::Prox(class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{  
    UE_LOG(LogTemp, Warning, TEXT("In Prox"));

}

Hey SystmShok-

Your setup appears correct, I had the same issue using OnComponentBeginOverlap and have entered a bug report (UE-29879) for investigation. As a workaround, you should be able to use OnActorBeginOverlap() instead, or set up the component overlap through blueprints with an event dispatcher / custom event.

Cheers