you don't describe your environment very well. If you have a server bridged to the same subnet as your router, you will have 2 DHCP servers, not good.
What is the subnet of your router?
What is the result of ipconfig/all on the host, the server VM and the client VM(s). Or ip addr if a linux client?
What are the settings in your Virtual Network Editor?
If you really want to use the DHCP server in your VM server, you will have to isolate it from the router, maybe with NAT. I have Windows and Linux servers as Domain controllers and I give all machines static IP's. That is the way we roll in our Domains, as well. Dynamic IP addresses come back to bite you very often.
