No license is currently required until it goes GA(Nov). You'll then have 30 days to migrate your license to Meraki if you want to keep it in managed mode. The license migration is easy, follow the guide below. Here's a helpful guide on the migration process including license handling https://meraki.cisco.com/wp-content/uploads/2023/05/quick-start-migrating-switching-DNA-management-mode-to-meraki-management-mode.pdf Best of luck!
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