New universal hardware switches include a Factory Default (Evaluation) License to use all features (excluding MACsec). This Evaluation license is equivalent to a Premier license. You can configure all features, except MACsec, without restrictions and save the configuration.
The evaluation periods is 30 days. If after 30 days you have not obtained and installed a Premier license (see Obtaining and Installing Licenses, and if you reboot the switch, the switch will effectively have only Base license (see Standard and Upgrade Licenses for Universal Hardware Switches) capabilities.
To extend the evaluation period, you can use the same EXOS trial license commands used on the non-Universal Hardware switches (see Trial Licenses for ExtremeSwitching non-Universal Hardware Switches).