Switch Engine 32.3 is compatible with the version of ExtremeCloud IQ ‑ Site Engine as shown in this table: http://emc.extremenetworks.com/content/common/releasenotes/extended_firmware_support.htm
Switch Engine 32.3 is compatible with ExtremeCloud IQ - Site Engine version 22.3 or later. Older versions (including Extreme Management Center) will not recognize devices running Switch Engine.
The ExtremeCloud IQ – Site Engine version 22.6 and Switch Engine version 32.1 can be used to onboard and manage the 5720 product line in non-production (demo/lab only) environments. For deployment in the production environment, an upgrade is required to both the Switch Engine firmware and the ExtremeCloud IQ – Site Engine version.