Guest cannot read VPN server filesystem

[aktiv]

Host: Mac OS 10.12 Sierra running VirtualBox Version 5.2.8 r121009
Guest: Windows 10 Pro with Guest Network = "NAT"
Corporate VPN: via Pulse Secure on the Host

When running the VPN, the Host can:

• Access the corporate intranet
• Access the corporate server network (e.g. "\\networkfiles\username")
• Run remote desktop to a firewalled server

When running the VPN, the Guest can:

• Access the corporate intranet
• Run remote desktop to a firewalled server

However, the Guest is NOT capable of accessing the corporate server network; all attempts result in errors; the network servers are not visible.

What am I missing; any ideas on what I need to set up for the guest so that it can access the servers?

Thanks!

Keith.

[aktiv]

Gentle bump.