Upon unauthorizing a Windows DHCP server, you may get the following error:

DHCP
The parameter is incorrect.

Most commonly, there are two reasons for this error to occur.

If you have just unauthorized a DHCP server, it may take a while for AD to replicate the change to other domain controllers. As a result, the DHCP server may still think it's authorized, whereas it is not. Either wait for, or trigger AD replication throughout your network.

Another reason for this error to occur is the presence of another DHCP server in AD that no longer exists. You can check this with the netsh dhcp command, available on any server with the DHCP server role installed:

netsh dhcp show server

Run the com  ...