Hello @Cosmic Storm
We need to set up a new RD license server first , then migrate the RDS CAL to the new RDLS.
Migrate your Remote Desktop Services Client Access Licenses (RDS CALs)
How to move/migrate RDS CALs to a New Server
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Best Regards
Karlie
"Since the servers are in different networks and can’t talk to each other check the box The specified source license server is not available on the network, then from the drop-down-list select the OS that the source license server is running. Now you will need to type the license ID of the source license server. For that open the console of the source license server, right-click the server name and choose Properties."