When using a floating license, a program that calls the Gurobi Optimizer must obtain a token from a Gurobi token server before it can solve an optimization model. There are a few steps involved in setting up such licenses. The first is to retrieve your license key. The key should be installed on the machine that will act as your token server. Once you have your key, you will need to start the Gurobi token server. The token server is a process that runs in the background, handing out available tokens to programs as they request them. Finally, each client for the token server will need to create a token server client license to allow client programs to find the token server.
Note that if you are setting up a machine as a client of an existing token server, you just need to create a token server client license.