DHCP server will not assign any IP address to the client machines and the following error is logged event viewer.
Log Name: Microsoft-Windows-Dhcp-Server/FilterNotifications Source: Microsoft-Windows-DHCP-Server Event ID: 20097 Level: Information User: NETWORK SERVICE Description: DHCP Services were denied to machine with hardware address <MAC address>, hardware type 1 and FQDN/Hostname <Machine Name> because it did not match any entry in the Allow List.
This will happen if you have enabled Filters on DHCP server and no MAC address are added to it.
Either add the MAC addresses of the client machines to the filters under DHCP or disable the Filter.
You can disable the Filter through DHCP Console.
Open DHCP Console.
Expand domainname.local (Domain name will be your local domain name).
Right click on Allow and choose Disable
By default these filters are disabled on DHCP server.
DHCP Offer Filter 20097