In order to get a more concreted idea of this issue, I would appreciate your help to collect the following information for further troubleshooting:
1.Would you please post the result of running ipconfig/all at the command prompt on the computer to let us know the machine’s configuration?
2.Make sure the DNS server is updated in DHCP(option 006).
After DHCP scope option is configured, it will take effect when we ipconfig/release&renew or restart the client.
3.If you don't want to restart computers, please run the commands in this order on your DHCP clients:
Then check if DHCP clients can obtain IP address from DHCP server successfully.
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