A company runs a critical backend service behind an internal passthrough Network Load Balancer in the us-central1 region. Client applications running on Compute Engine instances in the europe-west1 region need to reach this internal load balancer's virtual IP address using the same private VIP. Currently, clients in europe-west1 cannot connect, while clients in us-central1 connect successfully. What change should the network engineer make to allow the europe-west1 clients to reach the load balancer?