Switch Engine 33.4.1 is compatible with the version of Extreme Management Center as shown in this table: http://emc.extremenetworks.com/content/common/releasenotes/extended_firmware_support.htm.
Switch Engine 33.4.1 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.
This version was tested with ExtremeCloud IQ Site Engine versions 25.5.10.64.