A company operates two on-premises data centers, each with a company-managed router. Both data centers have dedicated AWS Direct Connect connections to a Direct Connect gateway via private virtual interfaces. The first data center's router advertises 110 routes to the Direct Connect gateway using BGP, while the second data center's router advertises 60 routes using BGP. The Direct Connect gateway is connected to a company VPC through a virtual private gateway.

A network engineer is informed that resources in the VPC are inaccessible from various locations in both data centers. Upon inspecting the VPC route table, the engineer notices that routes from the first data center are not being populated. The engineer must address this issue in the most operationally efficient manner.

What steps should the network engineer take to resolve this issue?