Source Console == Original Console
Target Console == The Console you are migrating the endpoints to.
On the Source Console, the Console the endpoints are currently communicating with, you would configure the following two settings in a System Policy that is only applied to the endpoints you wish to migrate to the other central Console.
The System Policy on the Source Console needs to be a higher priority than any other Policy that may have those settings configured.
You can copy the correct value for that setting by editing the clientsettings.reg file that you can download from your Target Console's consoles/services page. In the clientsettings.reg file that you download there will be a line with the setting encKey="your encryption key"
Do not copy the quotation marks, just the value between them.
Please also ensure that you do not have that setting configured incorrectly in any policy on the Console.
The Console\serverUrl should be configured on the System Policy on the Source Console with the URL of the Target Console's Services page which can also be found in the clientsettings.reg file downloaded from the Target Console's Services page. Please ensure you use a URL that can be reached from any of the endpoints you are migrating. The serverUrl is the URL to the console Services location which is the HTTP or HTTPS URL to the console web service (e.g. https://yourserver/Services).
Please just apply to System Policy on the Source Console to just a couple endpoints of each platform (Windows, Mac, Linux) first to test your settings before applying it to many endpoints.