Can someone please explain to me what I'm doing wrong?

I have an assignment that I'm tripping up hard on. Basically, we were to create a windows server VM with a domain and then create a client windows 7 VM and attach it to the domain.

While the client has been attached to the domain already, and the client can ping the server, the server can't actually ping the client (Destination host unreachable).

I gave the following to each machine:

Windows 7 Client Adapter 1 - Internal Network IP 192.168.100.10 /24 DNS 192.168.100.1 Adapter 2 - NAT Network DHCP

Windows Server 2016 Adapter 1 - Internal Network IP 192.168.100.1 /24 DNS 127.0.0.1 Adapter 2 - NAT Network DHCP

I made sure to turn the firewall off on both machines. I also changed the server DNS to 192.168.100.1 thinking that was the right thing to do?

If someone more experienced than me could please please help I'd really appreciate it.

If more information is needed I can supply it

Thanks