Hi,
Thanks for posting here.
>>"the server has two network cards installed and configured, both have IP addressing in the same segment,"
My understanding here is the VPN server has 2 network adapter and the IP address of these 2 NICs was in same subnet. Is my understanding right here? If yes, please kindly note that installed 2 NICs on VPN server is correct, but one NIC should connect to the internal network with private IP address, the second NIC should connect to the ISP connection using a public IP address.
Please re-configure the VPN server and the client to see if the windows 10 client can access to resource in Internal network.
Here is an article regarding of how to install VPN on Windows server 2012 for your reference.
https://www.thomasmaurer.ch/2014/01/how-to-install-vpn-on-windows-server-2012-r2/
Please Note: Since the websites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of this information.
Hope my answer will help you.
---Please Accept as answer if the reply is helpful---
Best Regards,
Sunny