Thats correct, AOS10 is a total new cloud-based platform and not the same as AOS8 controller-base systems. Aruba Central don't have any AP,PEF,RFP,etc. licenses.
Aruba Central have one device subscription per AP and have two forms "foundation" and "advanced". For gateway and controllers there are only "foundation" subscriptions per device and this subscriptions have to match with the device type (cx6200 have other subscriptions as a CX8300 or gateway). For gateways there is an option with or without SD-Branch.
See this link for more info https://www.arubanetworks.com/techdocs/central/latest/content/nms/subscriptions/overview-licensing.htm
There is no refund program for your existing AOS8 controller-based licenses but you can contact your HPE Aruba Partner to see if something is possible. This will also depends on the age of the licenses.
On the other side of the story is that Aruba Central as Cloud-Based solution is centralized, flexible, and will lower your overall management cost. No more Airwave or Mobility Master to keep running and maintained, less power consumption, less resources claimed on your hypervisor farm, updates are much easier/faster . And daily management will be much more easy even as deployment cost.
Noted that TAC support is includes in the Aruba Central device subscriptions, no more need for yearly renew your AP,PEF,RFP support packages.
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