Hi ,
Welcome to our new Microsoft Q&A Platform.
Based on my research, stand-alone or workgroup DHCP servers running Microsoft Windows 2000 Server or Windows Server 2003 cannot become authorized in Active Directory networks. They can only coexist with these networks as long as they are not deployed on a subnet with any authorized DHCP servers. (Note, however, that this configuration is not recommended.) When a stand-alone DHCP server detects an authorized server on the same subnet, it automatically stops leasing IP addresses to DHCP clients.
DHCP servers must be authorized if they are to be integrated in Active Directory networks. Only domain controllers and domain member servers participate in Active Directory, and only these server types can become authorized.
I'm wondering why you want to authorize a DHCP server in a workgroup?
For more detailed information, you can refer to the link below and focus on the session 'Authorizing the Server'.
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
Best Regards,
Candy