Only one license is required for an HA pair. The warm spare unit does not require a separate license. Alerts for Warm spare failover can be configured on the Alerts and Administration page.“ https://documentation.meraki.com/MX/Deployment_Guides/MX_Warm_Spare_-_High_Availability_Pair „Do I need duplicate licenses to cover my security appliance in a warm spare configuration? A: No, if two security appliances are in a warm spare/HA configuration licensing is only required for one of the two devices. The only additional cost of a warm spare configuration is the redundant hardware.“ https://documentation.meraki.com/zGeneral_Administration/Licensing/Meraki_Licensing_FAQs
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