Hi Tony N,
Thank you for your question.
Here are two topics with issues similar to yours that can help you resolve this issue:
https://social.technet.microsoft.com/Forums/en-us/c1b22ab0-5d91-4527-b3da-cdaa91d61ce9/criar-vrios-escopo-dhcp-windows-mas-activar-dhcprelay-no-switch-com- vlan?forum=winsrv2008pt
If the answer is helpful, please vote positively and accept as an answer.