Setting up Overlap delegate is not working. Bullets not colliding with walls, but phase through | Unreal Source | Page 1

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I am having trouble setting up overlap collisions in C++. I'm using this Youtube guide and I'm following it to the letter. https://www.youtube.com/watch?v=Mh3YHTMQjtc&list=PLoReGgpfex3z12PPCPK7W76Y2q1KNQtxH&index=10
In VS, I have this snippet about the "Collision Sphere" CollisionSphere = CreateDefaultSubobject<USphereComponent>(TEXT("Collision Sphere"));

In my BaseProjectile class i have the delegate,
CollisionSphere->OnComponentBeginOverlap.AddDynamic(this, &ABaseProjectile::BeginOverLap);

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Overlap Events in C++ - Unreal C++ Course #9

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BeginOverlap looks like this;

void ABaseProjectile::BeginOverLap(UPrimitiveComponent *OverlappedObject,
AActor *OtherActor, UPrimitiveComponent *OtherComp, int32 OtherBodyIndex,
bool bFromSweep, const FHitResult &SweepResult)
{

UNiagaraFunctionLibrary::SpawnSystemAtLocation(this,ImpactParticles, GetActorLocation());
GEngine->AddOnScreenDebugMessage(-1,5.f,FColor::Red,TEXT("HIT"));
BulletHit();
Destroy();

}

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When I spawn a projectile,, it simply phases through the wall despite me hahving ticked "Generate Overlap events" in the wall. What am I doing wrong?

#Setting up Overlap delegate is not working. Bullets not colliding with walls, but phase through