In an Availability Pair, Right to Use (RTU) for APs and switches are shared in a
                common pool by both primary and backup controllers. When both instances of 
ExtremeCloud IQ
     Controller are
                operational and the tunnel is up, the primary controller checks the licensing server
                for APs on both controllers. When the primary 
ExtremeCloud IQ
     Controller is down, the backup controller
                checks with the licensing server for APs. The backup controller will be synchronized
                upon the next automatic sync with the licensing server. You can also manually sync
                with the licensing server. Select 
Synchronize Now.

Note   
The Deployment ID for controllers
                    in a High Availability pair is the Serial Number (Locking ID) of the primary 
ExtremeCloud IQ
     Controller.