In the context of the license procedure, you can install multiple license keys. This is required, for example, if your configuration is a cluster environment of hosts that can be switched to standby hosts if an error occurs (high availability strategy). If standby hosts are defined for the message server (or SAP System) in high availability configurations, you need to set up a license key for each standby host. You can determine the hardware key of the standby host either as described in Determining the Hardware Key, or by executing the command saplicense -get (System i: saplicense '-get').

Request your high availability license key as described in SAP Note 181543.