"Z-Series and vMX licenses can be added to organizations regardless of the MX license type currently applied." https://documentation.meraki.com/General_Administration/Licensing/Meraki_MX_Security_and_SD-WAN_Licensing#FAQ https://community.meraki.com/t5/Security-SD-WAN/Can-I-add-Z3-s-with-Enterprise-Licenses-to-the-same-org-as-my-MX/m-p/66265
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